Brian, Having your license is a must. Even if you do not become an active realtor the other percs are worth it. But A rule of thumb I use is that the homes sold are average on average. LOL, as a whole some will be better and some will not be but on average the home prices will average out in your radius search. I also know that when my home is done that it will be in much better shape than most if not all of the comped properties.
But if you are still a little bit uncomfortable with this is take two hours, map out all the homes and then drive and visit the neighborhood. Not only look at the comps, but the other homes in the community. In my case I typically rent out the home, so I want to know is this a good neighborhood for a rental. I drive up and down all the streets in the area of where the home is that I am buying. This tells me so much about the value of the home I am buying.
I keep my geographic area of home purchases to with 20 minutes of where I live, so I know most streets, but it is still a good practice to scout out the neighborhood.