What style are you going, tamedog? If you nollie too hard, you will over rotate, especially if you are off the end of a box, roller or whatever. If you tuck right, you'll get the rotation and it will be more controllable with a smoothly popped nollie. When you nollie, think about popping not just forward (this is what causes the "huck") but forward and up and using your tuck to get the rotation, not hucking it out. In short, tuck not huck.