Knightmagic,
Ultimately you're going to have to make the decision if you want to do the trim flight yourself or not. Even if you have the skills to do a trim flight it will still come down to if you are mentally ready to do the trim flight. If you are too afraid of doing it then it's going to be hard to trim it out no matter what. But let me make this suggestion. You do the trim flight, but have someone walk out with you. This will accomplish two things. First, he can help you by making any trim adjustments for you so you won't have to take your fingers off of the sticks to find the trim tab. And second, if you get into trouble he can help by taking the radio.

Whenever I make a trim flight on a plane I always have a buddy walk out with me. To help adjust the trims in case they are way out of adjustments, and also for moral support. No matter how many years you have been flying and how many planes you have trimmed, you still get nervous when you go out there there to do it.

Have a buddy walk out with you. You should do fine.

Hope this helps

Ken