Don't get in a hurry. If you don't have enough time to do it right, start the job at another time.
Develop a system or routine. Follow it every time.
A chronograph is one of the most valuable tools. If you are working up a load and see a sudden spike in velocity, you just passed the max load. Doesn't matter what your brass looks like or that your bolt opens easily, it's time to back up a half a grain or so.
Only keep one powder can on the bench at a time.
Don't mix cans of the same brand/type of powder.
Don't pick up used brass. You never know how many times that it has been fired. Brass is relatively cheap, hands and eyes are priceless.
Store your primers separate from your powder.
Have fun. Do it safely. You get a great sense of accomplishment when you shoot that .25" group or fill the freezer with your own custom load.
