Remember that most of the really bad prop accidents occur with engines that are already running, not during starting. Adjusting the needle valve is where a lot of people get hurt bad. Another thing to watch out for is for a plane to unexpectedly go to full power because you accidently bumped the throttle stick on the transmitter while you were fixing something on your electric plane. Always pull the battery before doing anything to an electric. If it is so big that it takes two hands to carry the plane, have a buddy carry the transmitter for you instead of trying to carry three things at once while heading out to the flight line.