Thanks for all your help and info.
Munch, I have attached a sketch of the yard. I have lots of newly planted trees (as shown in circles) that I like to have automatic irrigation to. The rest is grass. Do you still thin I can't put some of the rainbird self installed in 3 zones for the trees?
btw, I am having a prof looking at the project next week for a quotation, But I like to learn to do it myself.