Hey bud, I've had to take down a couple of sheaths. Even after stitching it's not that bad, you just need to use a very sharp and thin blade and be careful.
Write down your steps then follow them. I've got something like 40 steps for a simple pouch sheath and those omit the most basic things that I couldn't possibly forget like final finishing and probably a dozen others.
Glad to hear you were able to separate it easily. Usually the parts are put together after they've dried and can't easily be separated without cutting.