CUSTOM CONAN ACTION FIGURE HELP!!!

If the head is on a ball joint, you should be able to heat and pop it off. If it's a cut joint, you'll probably have to crack open the body, along the seam, to get it off.

For the boots, if there's a joint, you should be able to remove them at the point where they join the legs (again by heating and popping it off), if not, you'll have to cut them off. Depending on whether you want articulation at the boots or not on the custom figure, you can simply glue the boots onto the wrestler figure, or, use cut joints, in which case, you may have to make a peg/hole interface if there isn't already one on the figure.