How do you make mescalin?

The cactus(coyote) is legal in my country(Denmark) and it is fairly easy to buy. But besides that coyote is the main ingredient of mescalin i have no idea how to make it. And i want to :) so if any of you have any experience with making mescalin; like what to do, and what not to, please help me. That would be awesome :)