whats the advantages of a manual battery over a automatic?
A small button correctly positioned on the battery to where it's natural. You control the battery and hence the atomizer. Hit it as you're going to take a drag and the vapor is already there. An auto activates on sound of the draw, so you start the battery and atty as you draw but it takes some time for the atty to heat up and vaporize the
juice... so as you draw sometimes the mouthpiece acts as a straw and rather than vapor you can get juice in the mouth. With the manual the vaporization is already started when you draw.
Also the autos have an auto cutoff and sometimes just when you're getting a good vape going it shuts off on you. Enough practice (supposedly) you can vape these mini's and super mini's but I got my 510 before I could get it down and never looked back.
The manual has a sealed battery so dripping directly on the atomizer doesn't hurt it. The worse thing you can do on a 510 is to 'hang on the button' - which is tough on batts and attys. But just don't do that

You'll get the hang of it. Gave one to my sister with just a little instruction. Didn't see her for weeks, then asked how it was going, any problems. "No. It's easy" lol. Not everyone has had that luck but in general if you read enough posts here and check out proto's poll you'll see which ones are more trouble free. (not totally trouble free but with the 510 you won't be running back to cigarettes just to get a good hit).