I've seen experienced flyers get their mind so wrapped up in something else they forget about safety and end up getting their fingers in the prop.

An experienced guy in our club had a 40%er with about a 24 inch prop and a 150 DA Gas engine and when he went to start it from the front (the plane wasen't tied down to anything) he didn't realize the throttle lever was on full and he about lost his whole arm when the plane came towards him and he tried to stop it!

Safety First! Beginner or Expert!