My DD turns 4yo next month, and we have just potty trained this week.
This is day 2 and she's had no accidents, every pee (and one poo) on the potty. By the afternoon today, she was going and sitting on the potty with no prompting. She's been wearing a dress with no knickers, and the first thing I taught her was how to hold the dress up when getting sat down.
I tried to potty train a year ago, when she turned 3, because she was aware of when she was peeing and pooing and i knew she was ready. I got a cheap potty and that was my first mistake - she sat on it a couple of times and even did a pee, but on the first day started screaming that it was hurting her back and legs to sit. I bought a different potty, but the damage was done by that point and she has refused to entertain the idea of potty training so I just completely left it. She has had a couple of books about potty training since then.
We have had a potty sitting in the corner of the living room now for over a year. A few months ago I started getting her to sit her toys on the potty. Then she started sitting on it herself fully clothed. Recently she has sat on it a couple of times naked. So spur of the moment this week I told her we were all done with nappies during the day. Pees and poos go on the potty, your body will tell you when you need one. Avoiding anything that she gets top absorbed in, as her focus on the potty drops. After a decent start she then became very upset and clingy, and then after about half a day she settled into it.
Im hoping tomorrow there will be even more improvement and I might even get some knickers on her.