I think that safety in these situations is in procedure. On full scale planes, the pre flight inspection is done exactly the same way every time. So is the run up before taking off. If anything is out of the ordinary, it will feel wrong. I always start my engine the same way. I NEVER change this procedure. This is more important than each individual step. I am always to the side of the plane when I hit it with the electric starter. I always oull my hand all the way into my body and then back toward the plane to pull off the glow starter. The important part is that this is very well ingrained, trained, burmed in habit. I will NEVER have the tendency to do it any other way. Procedure, procedure, procedure.