Although I liked a bunch of what you said in your OP, USPAP, this part jumped out at me
I've had 4 people call me over the past 5 years (1 just within the past few weeks - he I have not taken out with me but did offer) asking about getting into this profession. All were very intelligent individuals with various degrees of professional backgrounds. The closest one I found with any real estate background was a female who had been working for a property managing company. The next "closest" was a guy who's father "owned some property"
All 4 I offered to take out with me for a "day in the life" (again, the 4th has not called back to take me up on the offer) I did not charge them anything for the time. I set it up so it was for vacant properties (lock box) that I didn't have to worry about time restraints, or borrowers/agents wondering what was going on, etc.
Yes, it was time consuming, but all seemed to appreciate it. All of them pretty much had the same reaction though regarding what went into an appraisal. They all thought it was just the "few minutes" at a property and BOOM you have a value and made $$$. Once I showed them the research side back at the office (very quick overview at that) and explained the "typing a report" ...