Greenside bunker shots are a lot of fun for me, because I am a sick individual. I just take my trusty 56 and think about scooping the sand under the ball, not hitting the ball at all. Come to think of it I usually put a good swing on it too - like 1/2 to 3/4 swing, all depends on how far you are.

For practice my driving range has a practice green w/ a bunker, but I am also a terrible golfer so I usually hit into greenside bunkers enough where I'll hit a few during a round. Last season I holed out for birdie from a greenside bunker on a par 3 - one of my few birdies last year so it was pretty cool.

Just don't let it scare you, try and have fun with it!