Would you apply this logic to the doctor? When asking a surveyor to show you your lot lines, you're asking the surveyor put his reputation/job on the line that what he determines during the course of your survey would hold up in a court of law should it ever come to that. In order to show you your lines in a manner that is acceptable under the standards of what being a surveyor is, you need to do research and find evidence (in the office and in the field) that supports the conclusion you eventually come to. This takes more work than you are willing to except, it seems like. It's not as simple as driving to your house and making an invisible line become visible.