Man, I've always wanted to do this. Best of luck dude! I heard growing it isn't very hard, but the extraction process is mind-numbing. I found this:
"First, the leaves are treated and cleaned. Next, using some chemistry all the active ingredients (Divinorin-A and Divinorin-B) are extracted from the plant, this process alone takes 3 weeks of patience. Then the liquid extraction is boiled down to an even more dense substance. Finally, it's painted on Saliva leaves, crushed (to increase surface area) and bottled into liquid dram vials to preserve freshness."
Gotta figure out what that "chemistry" is.