Hi Dario, I went through the same exact thing. I started with a mini 901 kit....... The batteries were not even manual back then and I had nothing but problems. I continued to smoke while using the 901 because it was not reliable at all. I would always have battery problems.
At the time one of the only available battery mods on the market was the Screwdriver (I know alot will booo and hiss) and it was very expensive. I decided I wanted to dedicate myself to quitting for my Wife and kids and my health. I plunked down the $150.00 for the mod(ouch). That was the beginning of the end of smoking for me. It gave a more consistent hit of vapor than what I had, and on top of that the batteries lasted almost all day. I found that once I had it, the urge to go outside and smoke dwindled without any effort. I was still using carts back then and primarily vaped DK RY4(back when the formula was awesome).
At first I had the same attitude about my vape needing to taste like a cigarette, but then I realized why do I need my juices to taste like 455holes.

So I tried some of the sweet flavors, but none of them really hit the spot for me (all DK based flavors).
I tried some juice mixing myself and failed pretty bad, so RY4 was my go to.
Then came the day when my Screwdriver had a switch start to get worn and would not fire properly.........
E-mailed Trogg and the sent me instructions with pictures for how to replace it. I replaced the switch and all was good, until it happened again down the road. At that point I decided that the switch replacement was an annoying task. Then comes along Whatever, he posted a custom mod in the modders section of the forum offering up an unnamed mod that has since become the adaptever. I ordered one since it was easily user replaceable. I was happy with it, but one thing about the small 3.7v devices was that I had to use really long draws and my jaw was not really used to it. My jaw would get sore and I would have to stop vaping to give my jaw a rest. I am a mouth inhaler and don't vape direct to the lungs.
Enter the Silver Bullet: I was reading about all the mods that were becoming available that used a higher mah 18650 battery and from what I gathered I would get 2 days of battery life out of this mod @ 3.7 and as a bonus I could try 6 volt vaping too.
So, I bought the Silver bullet and liked it alot, but it had the same issue for me @ 3.7(sore jaw) So I go online and purchase some 3.0v cr123a batts. It turns out that it's not safe at all to use 2 unprotected Lithium-Ion batteries stacked in this mod.
I actually saw 2 post's on forums of users having them explode in their faces because when the batteries failed they could not vent properly. So off I go to do more battery research. I found that Lifepo4 batts have a safer chemistry and SHOULD be suitable for 6v vaping, so I buy 6 of the Tenergy Yellow batteries and have not had any problems. The thing I loved about the mod is that it had a native 510 connection so I did not have to use adapters anymore in my Screwdriver and made my #1 go to the Silver Bullet. At 6v I was in heaven, so I thought.
The problem I was having now was that the atty would run way to hot for carts or direct dripping without a mouthpiece. I would actually take the blank mouthpiece and take off some of the plastic off the side the enters the atomizer to use for dripping. This solution was kinda ok, except that the mouth piece would get loose after alot of use and I would have to make another. I even tried some of the cart mods out there, but none of them really solved my problems.
Enter Super-T: I was hearing blurbs around the net about Super-T's drip tips made of stainless steel. I go on the site and find that they are perfect for what I need, but they were like $18 or so apiece and I felt that was kinda steep. I order a contour shorty, but find that it is too short for the high temps of 6 volts. I order again, but this time I order the full length contour and regular one. Problem solved, I love the things to death and still have all 3.
One thing though about my goto e-liquid at the time RY4, one day I get a bottle and it tastes wrong. So I order 2 more, and again both taste wrong(Gah!!!). So on the hunt again I go for e-liquid...........
After some research I come up with a place called Tasty Vapor. USA made liquid, that is not Johnson Creek?!?!? with an affordable price? WTF? I was one of the unlucky people that paid a premium for Johnson creek liquid, just to have it go green.
Don't get me wrong, I did love the original Tennessee Cured (heard it has changed since) but the pricing was ridiculous and most likely still is. With that said, Tasty Vapor has been pretty good to me with the way they sell liquid and doublers. I buy one bottle of 48mg liquid and cut it with the double to extend it for a while. Most of the flavors they offer are sweet, but like I said earlier why should my liquid taste like 455?
I forgot to mention that I did try a 510 manual kit before I bought the silver bullet to try out the atty/batt and found the battery to be the weakness, but loved the atty.
All in all though, most of the information that helped me along my quest was found on this very forum and by various video reviewers including the guy you mention Igetcha69. I am able to produce vapor like he does using my various mods. I have been able to mask my iPhone screen when I puff a large cloud in front of it, and have had to wave it off. It may be due to the fact that I do like VG in my liquids as it give me that full lung feeling and produces much vapor, plus my inhale technique.
You are actually lucky you started only 3 months ago. You have a wide range of products to chose from, when I started the 901 auto batt kit was almost the only thing to get LOL.
Now I wait for my Pro-Vari to ship, I am hoping this helps me dial in each atomizer to it's sweet spot so each will perform at it's best. I know it's pricey, but I am willing to spend the money as I have saved a ton of cash. The last pack of smokes I bought cost $9.56(American Spirits). I would buy a carton every 2 weeks.
I only read the first page and did not read any of the developments since the first post, but thought you would like to see my experience. I always recommend the silver bullet and Ego style batts for new people that I know that want to quit. Most are afraid to spend the money, but the ones that have the SB package have quit. Although at work 2 guys bought Ego-T mods one has quit and the other I believe, just needs to learn how to use it he claims he smokes on weekends only.