I don't really remember potty training my first two kids. There are many things that the brain just doesn't hold on to, probably because it's better to not remember some things. Potty training is not very fun depending on your kid. I do remember my son picked it up pretty quickly, but I'm not sure how much his pre-school had to do with that. He was my first so I didn't have anything to compare it to.
My second (oldest daughter) took a little longer. She just wasn't really interested and then when she was almost 3 she just did it. Just like that she decided she wanted to use the potty like a big girl. I've seen so many people stress about potty training - fighting their child and/or really struggling. I'm convinced that when they're ready, they're ready. So, if you start too early you'll just end up fighting them and making yourself miserable until their ready. As a good friend told me - 'They are not going to be wearing a diaper when they're 10, so who cares'. Yes. Exactly. Pick your battles and don't stress.
Well, the third one came around and we were just lazy. They were working with her at school, but that was only 3 days a week. She would then be home 4 days a week and I would put her in a pull-up because I didn't want to deal with it while running errands or doing family things. Her teachers were so great and didn't really say much. So, one day I just decided to send her to pre-school full time for awhile for the sole reason of them potty training her.
It really made so much more sense - she stayed in her small room with a potty no more than a few steps away at all times, clean clothes in her backpack and teachers who made her go often. I was just not good at that - I would forget and she would have an accident or I just put the pull-up on. Lo and behold she potty trained quickly and after awhile I sent her back to pre-school only 3 days a week.
So, yes, I sent my kid to full time preschool so they would do all the hard potty training work for me. That's my confession. It really was win-win. Baby LOVES going to pre-school, and now I don't have to buy pull-ups any more. Now, just to work on getting out of night-time diapers . . .