Relax and dont worry too much!
My two pennines worth - Main thing is relax as far as possible and dont get too stressed out by the prospect.
It is worth just remembering that the plane wont fall out the sky if you forget the odd Freda check or delyaed in switching the tanks (might do for too long on this point). Just remember your fall back line features to check against should you get lost, i did mine around the South West so had plenty of coastal features as backup. I think for peace of mind even a basic GPS like an etrex will be a bit of a comfort blanket.
I wish you all the best with it and i am sure you will find it exhilirating, dont get too hard on the brakes after touch down, like i did and lock the blighter up for a stretch!