UTM,

You don't need any cams. OK, you got the Synergy wheels on your bow. There should be about 5-6 slots on the side that your string can fit into. To shorten your bow you will definitely need a bow press. I seriously doubt that you will be able to shorten the bow to your drawlength. If you got what you said (Cabela's) above and it's a 70lb'er then the shortest you will be able to go is 27". In other words, you lack experience, and whoever sold you the bow is an idiot, too, as they sold you a bow that doesn't fit you.

If you should need new cams you should go to a proshop and get them. They will most likely have to order them from PSE. Not many shops stock these items. The other problem with smaller cams is that you lose peak weight from the bow, but you did say that you like a little less, so it might work anyway. The only way to find out is to go to a good pro-shop (not Cabela's) and see what they have to say. You might also get on the phone to PSE and tell them what you'd like to do. Maybe they can make it work or maybe not, but they'll tell you if it can be done and what to expect from the change.