If the plane has already flown, there's no reason for it to be uncontrollably out of trim. You're the only one who know if you're ready or not. If you have doubts about you abilities, then I would suggest getting help. If you do try it on your own, I do have some advice. Don't take your eyes off the plane. If you need to look at your radio to find the trim tabs, raise the radio up to eye level. That way you can see your radio and plane at the same time. Good luck.