No reason to be nervous.

One of the greatest qualities of trainers, is no matter how it is built, it will still fly. Wing warp, vertical stab off center, wing saddle off or the horizontal stab just down right wrong, it will still fly. Thats why they are trainers.

My first plane I built myself, a Sig Scamp, wasn't even close. Built two right sides of the plane and the vertical and horizontal stabs were not even close to straight. It flew well.

Trainers are designed to do two things. 1) Teach you how to build/cover/set up. 2) Fly.

Covering? Just get the stuff on. If it does not look great, thats OK, just put some stickers on it and make it look cool.

Have fun.