I know that this is flame bait but there are several local places that offer sprinkler system design. They then turn around and sell the materials you would need for the installation. My question for this board is, what do you think of these co's, and why would you recommend your (professional) services over this type of service? And, something that I have heard that I haven't seen around here is sprinkler line pulling. The only options that I have seen around here are trenching. Would you recommend pulling instead? More specifically, what is pulling, and is this something that I should shop around for.