Sandy is potty trained. She did it mostly herself.
For a long time, she has been willing to pee in the toilet occasionally. I didn't pushed it, but did reward her with jelly beans if she went.
In November, Bill came home with a toilet seat. Without any prompting, she climbed up on her new seat and pooped. She never went back.
We did occasionally use pull-ups to get us through Nursery, etc. But she has now been in panties exclusively for 2+ weeks (naps, nighttime included) without an accident.
Wow, that was easy when we waited for her to be ready. I'm glad we didn't push it a year ago (and several times since) when our pediatrician recommended we do so.