WELCOME TO THE TEAM STEPHEN
You've made an awesome choice going for a REO. Your not gonna regret it at all. Love my mini's since I can completely palm them in my hand. Also, that 3ml juice bottle will last for a while if your a moderate vapor and if not. It's not an issue since you have an extra bottle with your mod.
The learning curve will be slight. Is it more difficult then dripping? Well that depends on the individual. If the person is used to dripping then it might be harder to learn how to "squonk" since you can't see how many drops are going into the atomizer during that time. Generally, one blind squonk (if you don't overdo it) will be the same as two drops.
The pressure in which it takes to press the bottle is going to be another obstacle. Since overdoing it will fill your catch cup. That will lead to a mess. My recommendation would be to do a blind squonk:
1. Lightly press the bottle
2. At the same time take a light draw without pressing the button
3. Once you hear a gurgle then stop
4. This will be good for about 5 hits before another blind squonk
5. It's best to vape your atomizer dry before putting it into your pocket.
I'm about to be a new owner of a silver REO mini. I have been using a Silver Bullet for the last month and liking it, but I wanted something a little more discrete to take to work with me. (The eGo batteries just don't do it for me anymore). Since I already use the Cisco LR306 with drip tip and bring 3ml bottles of juice with me, the mini looked like a perfect match for me. This will be my first experience with a bottom feeding system. Is the learning curve any more difficult than it is for dripping?