RE: Cowl Trimming...
You're a smart man Kevlar!
I always try to involve mine as well (43 years) by letting her pick from among two or three I've selected, and at times, enlist her help also. In fact, after several years away from the hobby, she's the one that bought me my first arf 3 years ago, and Christmas of 2005 an CMP Yak 54-140 for a Christmas present.
There is one thing that one must always remember, "Experience is a hard teacher. She always gives the test first and the lesson sometime later!"
Phillip