Kali....I will agree with you one this...most appraisers don't do pairs analysis on every appraisal to make the adjustments. First of all, if we did that, we would have to charge $1,000 per appraisal. Secondly, after you have done more than 9,000 appraisals I will give you the right to tell me my adjustments are not correct. You see, we development adjustments based on the market and those files are maintained in two places... our appraisal files and our mental file. This is one of the very good reasons to have a requirement that the mentor be certified with a minimum of five (5) years of experience. I personally know of appraisers with less than two years total experience attempting to mentor as many as 6 other appraisers. Dumb, huh?
In the beginning you should do pairs analysis to determine those adjustments. You could also trust your mentor to have the knowledge to make those adjustment too. This is not rocket science, it's an art. I instruct the registered appraisers 75 hour pre-license course here in Colorado Springs. In every class I have students asking me for the "magic adjustment" list. There is no such thing.
Do yourself a favor and develop the concept of percentage of contribution for adjustments. As an example, what is the adjustment for a two car vs three car garage? Would it be the same in, say, a $150,000 house as compared to a $350,000 house? If that percentage works out in your market to be, say, 2% then the adjustment in the $150,000 range would be $3,000 and in the $350,000 range it would be $7,000. This could be what your mentor is mentally doing when she reviews your work.
In any event, keep asking your questions. Be open to suggestions and learn the skills associated with this business. I wish you well.