the other day i broke rule number one in giving estimates, i didnt get out and survey the land. i usually schedule estimates and take my measuring wheel and walk off the whole area then give my estimate. well, this one was a friend of a customer and i was dog tired at the end of the day so i just drove up and looked and told him 55. well, today after i cut it, i was kicking my self in the rear the whole time thinking i should have charged 70. now i've messed up estimates in the past by a couple of dollars and just lived with it but this one i know i'll end up doing a 55 dollar job because i know it should be 70. what should i do? should i contact the customer and tell them that i will have to raise the price to 70 because i underbid and that the first cut will be 55? help a fella out here. thanks. randy.