I did mine last summer. Dd was 3.4.
I got in some charts, some stickers and a potty.
Let her choose nice knickers and then we just went for it.
Let her run around naked as it was hot apart from the knickers.
First day was absolutely hell. Cleaning up wee so many times. I could've cried. Seriously doubting myself but I persisted.
Tuesday after that, the 2nd day, just when I thought it couldn't get any worse, it did.
Wednesday, we had loads of successes and the odd failure.
Thursday, done. No more accidents.
She had a sweet everytime she did a poo and a sticker every time she did a wee.
Once the sticker chart was full she got to pick a toy.
I had been putting it off so long because I was scared and it was surprisingly easier than I thought.
Hope Ds will be the same