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Take Pictures of the pipe exposed in the trenchs...that way you will have a record of what U did.

Agree with tapping off the main water line...if U have high H20 pressure, U may have to install a pressure regulator. Put in a Cutoff valve in front of every Sprinkler Valve Manifold. Put a main water line to the back of the house and put in a Low Voltage Electrical Line for Automatic Sprinkler Valves in with it ( it would be bettter if you put it thorugh the Grey Electrical pipe so that you can't accidentally cut it with a shovel someday). Also plan for an extra Hose Bibs. What is called for is that the spray pattern for each Sprinkler head reachs the center of the head of the one next to it. Then there is the myriad of Sprinkler Spray pattern nozzles. Low angel, 1/4, 1/2, 3/4 etc etc etc... All main H2O should be schedule 40 (heavy Duty) and secondarys schedule 125, they should all be Primered and then Hot Blue Glued. Toro and Rainbird makes good components. Another thing is to come off the Main House H20 line with the same size pipe I think usually 1" to a 1" Sprinkelr valve and on the outflow side step it immediatly down to 3/4" pipe to boost the H2O pressure. Also Grass areas should be on their own line and not shared with shrubs.

I did most of the Irrigation system at my house in CA. I had 13 Stations with 360 heads, and 3 extra Hose Bibs all backed with a Proffessional 18 station Iritrol digital timer.

Here in LV I have 3 auto valves for a Drip System with 2 extra Hose Bibs.

BTW my system in CA was working nearly perfectly after 13 years. Mostly I had to clean out and adjust a few Sprinkler heads every year.