I use google earth, if i am able to see all the lawn areas clearly and get a street view i usually can get a good estimate on mowing, or lawn treatments. anything else and i have to go look. There is no way i'm gonna drive to every estimate now. out of the 20 to 30 calls a week i've been getting its mostly people wasting my time anyways. I ask a few questions and quickly come up with a decision if its something worth riding out too look at. I just want to cut my miles down a bit. It works great for me now, but yeah mabee treading some dangerous territory.. lol. I use my best judgement. However, i let them know the price for lawn mowing is based on the area to be mowed, any degree of difficulty could raise the price some. I've never had a problem with it, yet.