Most of the time you can go to the website whose products were used. I like the Rainbird site a lot. If you are looking to adjust heads, adjust your timers, etc... that is explained pretty well and is pretty straight forward. It depends on what you are trying to do to the system. Most of the time, adjustments are fairly simple and just take time. If you can't find the information you need on one of the websites, Lowe's or Home Depot employees can give you basic information on your system usually.