First you cut a branch off at the node, then you get a clean razor and make a 45 degree cut, third you scrape the bottom inch with the razor blade just enough to make the stem a little frilly. After that you can splice the up the middle and dip it in some cloning gel. Pop it in your medium.
I don't know if cloning tomatoes will prepare you for MJ, seems like you could practice on them as well. But y