This years marks my 25th year as a reloader.
The single most important piece of advice I can give to new as well as experienced reloaders:
DO NOT BE DISTRACTED = REMOVE ALL DISTRACTIONS FROM YOUR RELOADING ENVIRONMENT.
You are assembling "mini-bombs" so to speak, 1 grain or even a few tenths of a grain separates a "hot load" from a small bomb with you having a front row seat.