The Tree of Life is a huge wealth of spiritual information. Taken one step at a time you will find it is very easy to understand and use.
The first thing to know is that the Tree is divided into sections. There is the ground floor which is where you start the process of examining the sort of life you have created for your Self. The next stage is all about the personality so this means looking at the way you: emotionally react and respond, think and communicate, and feel about your Self - and others - and form lasting relationships.