Many lifters learn the bench press from powerlifters. And powerlifters certainly know a lot about it. But remember, their goal is to lift the most weight possible for one rep, and they often use special lifting shirts.
If your goal is to build size as well as strength, and you lift raw (without a stretchy lifting shirt), then your pressing form will be different. Here's a quick video lesson.
"Bill Hartman is the smartest man I know," Alwyn Cosgrove said recently at a seminar. I don't know about you, but that's pretty esteemed praise, especially from someone like Alwyn who's considered one of the foremost minds in the performance enhancement industry.