I'm wanting to get into servicing my lawn customers irrigation systems. The spring start ups, winterizing and if they have any problem with heads or controlers. I've had a couple ask me to do it before but I've turned them down due to lack of knowledge in this field. If I'm going to do something I want to know how to do it and do it correctly. What is a good way to get the information I need? How to do it and what tools are needed?