Recently moved into a Southern California house with an existing underground sprinkler system; 5 manual valves for 5 zones; 3 in front yard (at front door), 2 in back yard (at back door); 3-4 heads per zone. New job requires extensive travel, so I would like to install a controller. Would prefer to install controller in unattached garage, but may use utility room at back of house (back door). Looking to see what is involved.