I think the biggest "tip" is to just groom good safety habits. If you teach yourself to always go through the same safe motions, they can take care of you in those times when your mind shuts off (as mine will occasionally do).

For instance, if you NEVER reach over the propeller and ALWAYS get in the habit of getting up and moving behind the plane prior to adjusting needle valves, removing glow starters, etc...then that time that someone talks to you in the middle of a start, or otherwise distracts you...you won't subconsiously reach over it when you're you're not really paying attention. Break this rule even once, and it's only a matter of time.

There really shouldn't be that much of a hurry to get in the air anyway. Besides not reaching over the prop, I always have my plane tied down and always have a hand on it...no exceptions (as if any of this were difficult). Take your time!