Agreed, they don't need clipped often, but when I feel them scratching me that's when I clip them. As Cooper said, if you buy some of the stick-on floor tiles that are textured and have the look and feel of slate or stone, and you put them down on the bottom of your enclosure/tank, this really does seem to wear their nails down and keep them from becoming sharp or too long often.
Clipping them is very easy, but keep in mind that they have a vein inside each of their individual toenails, along with a nerve, just like dogs do, so you only want to clip the tiny portion of each nail that you see sticking out over the cuticle or the "pulp" of the nail. If you look at his nails from the side angle, you'll see a tiny little bit of nail that sticks out beyond the "pulp" of the nail, which is the white part that runs along the underside of each nail down to the toe. You only want to clip off the tip of each nail that you see sticking out beyond that "pulp". I find it much easier to just go through and clip the tip of each nail off rather than filing them, but that's going to very from dragon to dragon and person to person. My guys just won't sit still long enough for me to file each nail, lol.