The first real step is to cut off any protruding branches. Once this is done you can determine the angle that you want to have for the chair back. Then hold two of the branches at this angle. Then tape the joint where the branches cross, make absolutely sure that it is strong. A little tip. Duct tape doesn't stick to wood very well, so wrap the tape around the branch and put the sticky sides together. This will make it much stronger. I also added a brace, which I made out of tape, to the bottom to keep the legs from spreading.