Do Vertical Pressing Before Horizontal Pressing
If you are going to do some form of military press and some form of bench press in the same workout try doing the overhead work first. I have found this to be a great way to avoid pain and strengthen your shoulders. I cant explain exactly why but the overhead work just seems to prepare you better for the bench pressing variations. I have had numerous people try this (many of whom had pain with any form of benching with a bar or dumbbells) and they all reported feeling significantly better.