Uh, ya kinda changing the rules mid-stream here.
First you ask what makes an "expert" and now you're relating that to "Expert flying skills". There is a difference here. A person who is an EXPERT with a trainer is not an EXPERT with a Jet or an EXPERT at 3D and not necessarily an EXPERT builder or an EXPERT with the ladies.

BTW - there are very-very few people who can rightfully claim to maiden ANY plane without being nervous.