Don't drink while reloading...
Smoking around primers can get very exciting
Don't reload after having a fight with the wife...You will load everything on a max load.
When reloading, only have one can of powder near your scale
Use a mini mag flash light to check all cases to be sure that powder is in them before seating bullets
When using any auto prime tool, have a jeweler's screw driver handy to get out primers that start in side ways
Double check your powder scale to make sure it is set properly
Cover your scope lens with a small plastic bag when you are cleaning your rifle, to keep the solvent off the lens
Keep accurate records on everything...especially the stuff that does not work, don't forget the OAL!!!
When you are getting your cases ready, stand them head up in the block till they are primed, mouth up means ready for powder.
If you leave powder in the hopper of the powder measure, put a piece of tape on it with the powder type wrote on it.
Don't drop primers in the carpet, it will cost you big time when the wife runs the vacuum cleaner!
Put the cat up if you reload on the kitchen table.
It's not a good idea to cast bullets on the kitchen stove YIKES!
Beware of loading for friends! They will always bring you crap for brass in all kinds of different brands.