It's part of the fun and sometimes frustration of this hobby. We are all always learning. Things change over time as new information and examples become available. In some ways, you are lucky as a new collector. Most old collectors have not only had to add information over the years, they've had to forget or modify information they've known for years just to keep up. I do take some solace knowing that the new collectors who stick with it will probably wind up in the same boat though. lol