Hunter & Rain Bird are two of the most widely used systems.

Go here, type in your zip. Visit a JDL store, JDL just sells wholesale
only, but they will provide you a list of professionals who install for a
living. Have a few out to find their install procedures.
http://www.johndeerelandscapes.com/s...Pro/search.asp

As George said, I would stay away from trenching. I was on a job site, and
the crew was installing as George said, minimal damage was done.

There is a Rain Bird store in the next town. I plan on going there this
weekend.