Trouble shooting was never a problem. I started in the golf course industry as a irrigation repairer that covered the heads, pipe, wiring/controller and the pump station. I have been designing, installing and repairing systems for over 14 years.
Funny enough, the residential systems gave me trouble as I was not used to working with such small amounts of water.
After my second install, it all came together for me.
My problem is where I work, the soil conditions are really terrible - mostly calcarious/limestone and some granite stratography. You don't trench, you have to literally rock saw.