I'd agree with everything people have said here, but I'd also add courage! I build models in grade school and high school that were pretty good, but mostly unpainted. When I did paint them, I used the Testors square bottle enamel and a brush. At the time, I was reading FSM pretty regularly. I'd try out some of the easier techniques, but I had a feeling that a lot of what was shown was way beyond my ability level.
I got away from the hobby in college and a bit after, but I kept buying FSM and even a kit now and again and I really wanted to build -- but I was afraid to. I was afraid that I wouldn't be able to build the kits so that they looked good. My expectations were much higher now that I was older.
I finally took the plunge last year and started building again. I started with a really cheap Starfix kit, but I paid attention to filling the seams. I hand painted the camoflauge, and the result was pretty good. After that, I started my current project last May. This time, I really focused on trying new techniques for glueing and filling seams, airbrushing the finish, using Future, etc. I'm nearly done with the kit, and I'm really pleased.
Anyway, there were several times during the building of this kit when I had to simply take the plunge and try to do something that I had read about. I think part of the reason this kit has taken me so long is that I did a lot of research on different tips and techniques before trying them, but at some point I had to muster the courage to actually do it and risk messing up.
Naturally, a lot of the stuff that other modelers do worked for me as well. That's been a real confidence booster. Even better, I've been able to solve some problems using what I know. Everytime I've gotten stumped, I've figured out a way around it.
It's great being able to post here and get/give tips and share experiences.
Regards,
-Drew