There is enough pressure to pop the fork cap out of your hands. I use a 1/2" drive ratchet wrench, that way I can keep opposing pressure on the cap. BTW, it's a good idea to loosen the caps before you take the forks off the trees. Once you have the forks off, you'll need an allen head socket to remove the damper rod screw at the bottom of the fork leg, I find that using an impact gun is most effective, but make sure you have the correct size socket and that it goes all the way into the screw head, if you strip the head you're f*ckt. When you're installing the new seals, it's a good idea to have a short piece of pipe to drive the seal in, I have a piece of exhaust pipe that works, but you can use PVC too.