I start to learn and work in watches for fun using TZ. No, it's not as easy as the tutorial show it. There is a lot of small part in there and you really need to develop skills.
But I think the first thing is to forget the fear. Yes, you will break something. Yes, you will loose that damn small spring. If you aren't ready to break something, pass hours to fix it and pay for extra parts, then forget it.
I'm about at 97% of completing my first PAM which I assembled completely from scratch as a learning project (striped the movement, cleaned, serviced, assembling) and yesterday I broke the stem. The last thing I had to do before putting back the crown guard and enjoying my watch. This is sometime frustrating, but it's part of the game.