Before you can begin your own project, you need a plan. Many manufacturers will custom-design a system for you that is specific to your yard and region of the country.
The manufacturer will supply instructions onhow to check your water pressure—typically, you need at least 30 to 35 psi (pounds per square inch) of pressure and about 10 to 13 gpm (gallons per minute) of water flow to support a sprinkler system. They'll also give you a template so that you can sketch your property boundaries. Send them the sketch and they'll return a detailed plan for your landscape—including specific instructions—and a list of everything you'll need to buy at the hardware store to put the system together.