Been there done that! When I first started I made mistakes, something that I do now is walk everything twice once in one direction once in another direction helps avoid any mistakes. The other thing I do if I get called away or distracted I will leave something right where I’m at, such as a hat or knife so I know right where I left off. Or when in doubt come back to where you know you’ve already inspected and continue from there.
The second one is much harder. Anybody on these boards knows that I’m asking questions quite regularly as I definitely don’t know everything. What I do if put on the spot is give my best gut opinion and say however I’m not truly an expert on that and want to go home and clarify and further investigate to ensure I’m giving you the most accurate information and possibly can. Reading these boards regularly, constantly watching YouTube videos, and not watching things like Mike Holmes will help build your confidence. Every time I watch one of his videos I get paranoid that I made a massive mistake.
My mentor taught me We are not specialists, We are generalists. Some of us have a lot more experience in some areas than others and there’s no way for us to know everything. Unfortunately mistakes will happen, keep some money set aside to pay for a small incidental mistake because they will happen. My mentor’s been inspecting for 20 maybe 25 years and he says he still makes mistakes. To error is human!
Figure out a checks and balances system that works for you and you avoid most of your mistakes. At one point in time I bought a GoPro just for inspections. I would do the entire house without it and then go back through as if I were documenting every sqyo inch of the house on the GoPro.