Warning! Get really drunk first. Then it won't hurt so much when you chainsaw your face off and crush your family.
First step - find a tree to cut down. No problem. As soon as you know how to cut down a tree people will sense it and constantly ask you to cut down trees for them.
It will help if you know some of the technical vocabulary:
Equipment: Every piece of equipment used in this process is called a "Widowmaker".
Tree Anatomy: The tree and every part of the tree is called a "Widowmaker".
Terrain Analysis: Everything in the vicinity of the tree is called a "Widowmaker".
Act really confident and relaxed as shown in this photo. (pics by ex_mo
I'm saying "you mean this tree over here?"