This is crowdsource after all. At first I wasn't very confident in my choices either, but if you are getting the general idea of the website, they aren't going to reject you. All of the ones I've ever done have approved, and I know that I was iffy on a few of the sites. Some business sites that do like whatever I have no idea really where it goes, I might put business miscellaneous or if I pick up on keywords form the site I'll try and find a category. It's not an exact science.