You have to have a strong determination and desire, work for a certified , reputable company and follow the winners, read the right books, the ISA cert arborist study guide and jeff Jepsoms books to fell a tree and a climbers companion are among them, there are many things that can kill you, and formal training and skill are the best ppe (personal protective equipment). purchase the best ppe you can, If you knew what you must do to get to be a production climber, and be a talented Arborist you would pick another career, cos it means intense concentration, long days, continuous training, and an out right dedication...its a purpose driven life, you will lie awake at night strategizing next days complicated rigging. If you stay the course which few can , and you say want to own a tree service you stand to command $175 per hr.
you really gotta be your own drill seargent