I'm really careful staring my engines.
I always double check that I have idle and touch the throttle stick to make sure.
I place the transmitter beside the plane (i.e not keeping it hanging from my neck) and always use 3M security glasses.

After I start the engine with starter I move around the plane, pick up my transmitter and remove the glow charger from behind the plane.
I also do all run ups and tweaks from there.

What really gets me is if someone close tweaks their engines at full tilt with the prop arc in my direct line. I really hate that and it's scary and bad respect.
Some people should really have an accident happen to them to realize the danger of a thrown blade or a runaway plane.