How to get bridge pegs out of a acoustic guitar when there stuck?

It is a good idea to get a bridge pin puller like Mikey suggested. However, sometimes those pegs are really jammed in there. If they are that stuck, even using a bridge pin puller has potential of breaking the pin off. So, remove whatever strings you can, and then on the one or ones that are stuck, loosen the strings and remove them from the headstock so they are only attached at the bridge. You can put your hand inside the body of the guitar and feel the bridge pin sticking through. Take something that fits into the soundhole but has a little weight to it. Sometimes I use vice grips. Put them inside the body and tap the bottom of the pin out so it pops out of the bridge.