It comes back to your really fast. The main thing I recommend is that if you are not used to using the clips and straps on pedals, DON'T try to use them.

I test rode a bike and rode back up right in front of my DH and the guy and BOOM, hit the ground. I was not used to the clips and straps and didn't get my foot out quick enough. The guy selling the bike said "I hope you are OK, OH, I hope you are OK"

Believe it or not, it was not really embarrassing and I didn't really care what he thought, because I was getting ready to spend a lot of money and I wanted to try it out first.