No great advice except to relax and don't push it. My oldest all of a sudden decided at age two to use the toilet. I was shocked it was so easy.

My youngest, well, he wasn't trained till about 4 and 1/2. It wasn't such a big deal, but we did explain every once in a while that he wouldn't want to wear diapers at school. It turns out that my son had an issue with thinking that people would know what he was doing if he went to the bathroom. Strange, but true. After a while, he finally 'figured out' that everyone poops so I guess it's ok.