Here's where having (or quickly getting) a network/team in the area of the property is helpful. I only buy properties outside of my state because... well, Hawaii is pretty darn expensive and often overpriced because of the shear 'ooh' factor. In the states where I purchase, I quickly find property managers, realtors and inspectors who can be my boots on the ground. My property managers are often 'retired' general contractors, so they are great at giving me estimates on repairs and what they think the value will be after the repairs. I get information from all 3 on the market and how appraisals are comparing to sale prices; what repairs will be needed, cost of repairs, etc. If your target market is individual home owners and the market is hot and people are routinely paying well above appraisal price, you won't care as much. If your target market is cash-flow investors (or investors and owners), this gets even trickier to evaluate.
Appraisals are interesting. Sometimes I care a lot about them, sometimes I don't. If you are going to sell to someone who is financing the property, the appraisal can matter a lot. Here's some important considerations:
1) Was the appraisal done only on sales comparison approach? (This is where the appraiser only compares the value of the property to other recent sales -- looking for comparable houses in the area.) If so, this is a significant factor for traditional mortgage lenders; any purchaser, whether they are purchasing to occupy or to invest, who is using a traditional mortgage in their own name will care about this. They will only be able to get a loan on 75-80% of the appraisal amount and they may not be willing to pay for the difference between the appraisal and purchase price.
2) Did the appraisal include an "income" approach? In my experience, this is seldom done on single family homes unless they are currently operated as an income property and the appraiser was told to evaluate it as an income property. I have seen significant differences on the value of a property using an income approach vs. sales comparison approach. I've also found that most of the appraisals I've seen would provide both approaches but often favored the sales comparison approach in making the final appraised value. Still, I've paid more than the sales comparison approach for my rental properties when the income approach (and my own personal analysis) showed the property would cash-flow.
3) Who is your most likely purchaser? Someone who wants to occupy the property or someone who wants to use it for cash-flow investing? If you are likely to sell to an investor who is interested in cash-flow, it will help if you know how to evaluate the property from a cash-flow investor standpoint. You'll need to do market research on rents to see if your proposed sale price will yield a positive cash-flow for those investors.
I hope this is helpful.