Skins aren't exactly glued together, but there is bound to be plenty of flexible sealant on the inside which will seem to be gluing it together. Judicious use of a putty knife to separate things is all that is needed.
One potential stumbling block is just in drilling out the rivets. A rivet removal tool is handy, or just careful use of a center punch and sharp (short) drill bits. You just want to avoid overly enlarging the rivet holes and slipping off the head.
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