I used to do that for a summer job... for like 4 summers. In fact, I still do it once a week for some extra cash on my days off from my regular job.
1) Do not buy your parts from Home Depot. Go to Regency Irrigation or Emco. Much cheaper (potentially, see #3) and better quality.
2) You should have a general idea of how it works before you do it. Most people I've had to go out and service are people who tried to do it themselves, monumentally screwed it up, then had to pay to get it done anyways.
3) Try and get contractor pricing through Emco or Regency. Not sure if you can get it, but try.
I have to run right now.... But ask some more specific questions and I'll try and get back to it when I get back to the office.
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