Powder the Mimosa, put 100 mg in a big jar, ad 100mg. Lye (granulated) and 1250ml of water, close it and put the jar away for a day.
Then ad 100 ml. Hexane/Heptane/Naptha roll the jar for 5 minutes, wait a minute and repeat 2 more times, extract the top layer (Hexane/Heptane/Naptha) and collect that in a jar, put the jar in the freezer, repeat everything 3 more times, so you'll have 4 jars of Hexane/Heptane/Naptha in the freezer, keep them there for 1 or 2 days, then take another jar, put a clean coffee filter over the hole and pour the content of your collection jars in that filter.
You'll now have approximatly 1 gram or 1.5 grams of DMT.
Make sure that you only extract the transparant layer, and no brownish stuff and your DMT will be perfectly white, then there is no reason to recrystalize it, but you can if you feel like it ofcoarse.
Couldn't be any simpler....
But like magickpencil said, the Nexus is the place to be.
Every question you have is probably already answered there.