Potty training: What a nightmare.

My daughter will be 3 in a few short months. I started potty training her about a month ago. What a nightmare this is. The good news is she likes to sit on her potty. I have tons of books for her to look at while she is sitting. She has only gone in the potty twice since we started. She will sit there sometimes for 20 minutes and as soon as she tells me she is done and I put her diaper on, she goes to the bathroom. I want to pull my hair out. I know it will take some time. I don't expect her to get it right away. The good thing is that she wants to sit on it. Most kids don't even want to sit on the potty. At least that is a big step in the right direction.