I have a small unwanted tree. It's 3' to 4' tall. Looks like an oak to me, but I really don't know. I'm going to cut it down. But it occurs to me, maybe I could use it to try some grafting techniques. The purpose would be soley educational. I would still remove the tree in the end. Can I graft parts of this tree to other parts of this tree? If so, when would I do it? Any suggestions?