It appears to me that it is required and that it takes three years of experience after getting a real estate licence and is accompanied by a test.

I tested the outlet and it was around 119 to 120.

Once you get to a point you are totally confident in your ability to analyze ARV, you can do it yourself, unless you need to the realtor to get the sales data.

Some of this data can be found online (if the county offers this service).

It's basically a "truth" test.  

Your scenarios should be based on the confidence of your projections (in statistics, it is based on the # of standard deviations from the norm based on the type of distribution for your data).

If you pass that test you get any deal you want in life..I listen hard Rock when I am doing Real Estate especially when go looking deals...

I put that in quotes, because it's really more of an old style correspondence course, with online testing and materials.

Would not hurt to take a seminar or class and then actually jump in a do a small test baby deal. 

So I use to do A/C work before I went back into the Army...What I would tell you is before you buy your next property, walk outside and check the data plate on the A/C system.