I feel you 1000%. NONE of my mentors ACTUALLY supported their adjustments. Like noodles, they threw numbers into the appraisal to see if they would stick. When I'd ask honestly "how do you know it's X for a [garage, bath, etc]" They would get combative and say... BECAUSE I JUST KNOW! In other words... they don't really know and had zero idea how to actually support their adjustments.
I highly recommend taking a course from the Appraisal Institute on Supporting your Adjustments.
But HONESTLY... The hands-down, BEST game changer for me was a webinar hosted by Josh Wallit & Dustin Harris (theappraisercoach).
Seriously... this was a GAME CHANGER for me. Anyone who says regression doesn't work or can't work because of a small market, I'm sorry... they're full of it. I live in a town of 33,000 people. seriously. And I use regression on almost every appraisal. This won't count for QE or CE, but it was honestly the best penny I spent in appraising.
theappraisercoach.com
Once you do this a few 100 times, you'll start to get a really good feel for what buyers are really paying for which items. When I can't support using regression, I default to a depreciated cost modified by a "sensitivity analysis." I get the Cost & Depreciation from the Marshall & Swift Residential Cost Handbook. It's about $349/year. IT'S WORTH IT! It's far cheaper than paying $16-$20/appraisal through total. And by using the actual handbook, you get a really good feel for costs and how the system actually works. (If your mentor isn't doing the cost approach... they probably should be. None of my mentors did that either. They just said... it's not applicable for homes over X years. But again, that's just lazy B.S. I've gotten the cost approach to come in perfectly (within $3000 of my sales comparison approach) even on a 100+ year old house. This explains how to get a copy
https://www.corelogic.com/downloada...hall-swift-residential-cost-handbook_scrn.pdf
Here's also a great article from OREP about proving your adjustments with great examples!
When I began appraising, I asked my mentor what adjustments to use- he said, "Figure it out for yourself." So I did. Here's what I learned.
www.workingre.com
Lastly, keep in mind... You have every right as a trainee to ASK how they support their adjustments. A lot of old timers don't support them though and asking them usually makes them irate because they know you're catching them out.
A mentor wants you to fill out the appraisal they way THEY do, they don't want you doing things like regression, etc. I got yelled at so many times by so many mentors for even proving adjustments using a matched pairs sales technique. With regression, my mentors just didnt' understand it.
So keep in mind, it gets to a point where yes, you are lucky to get your hours. And yes, we SHOULD be backing our adjustments. But if your mentor will not allow you to back your adjustments using a provable methodology.... do it anyway, keep it in YOUR workfile for that property. That way, if the state ever asks, and they want evidence, you can prove you DID the work and your supervisor required you to change it.
I know of at least one person in my state who trained his son SO POORLY, BOTH appraisers were pulled in front of the state board and had to take remedial education because the appraisal was crap. I honestly doubt that would ever happen, but if it did, you could PROVE you supported the data but your figures were ultimately changed by your mentor.
I hope this helps!