Once you are fairly comfortable with him wrapped in a towel and on your lap, you can pull one foot out at a time to do it yourself. Fingernail clippers are the closest thing we have to a good tool for this. Remember to not cut his claws, but cut the tiny sharp pins that grow out of the end of a claw.
Boy! There is much too much important information to relay through e-mails. You can read the whole body of knowledge about the green guys by reading this: