I'm a PLS in California, and can tell you surveying can be quite complex. When performing a boundary survey there is typically a lot more work done in the office than in the field. A surveyor has to research the subject property, which usually means researching the adjoining properties, too. This means going over any available maps and plats (there aren't always reference maps available - not all land has been surveyed, even in places as densely populated as CA), deeds, conveyances, dedications, condemnations, legal descriptions, lot line adjustments, court findings, etc. etc. Most surveyors are college educated and professionals are licensed for a reason. Surveying is not just turning angles and shooting distances. The toughest part of the job is done behind the scenes.