Hi Mark....glad I could help a little bit. [8D] You'll be fine.....just have patience and don't be afraid to try new modifications. Just do it one at a time and keep a log book. Each model should have two pages. Any changes should be recorded...along with comments of how the plane responds after. Write down the trim settings used for each model etc etc. It is really helpful in the long run if you stick with this hobby.
In this hobby....at the field and online.....you'll meet all kinds. Be Patient, but stop crap in it's tracks. You seem like a nice person, so have fun.

Cheers.

Kaz.