https://eric.org.uk/potty-training/ Some good information here, ERIC have lots of info on bladder and bowel things. Re nursery I know ours we have to take a potty in. The one my eldest went to they had some there, and took in lots of spare clothes and socks and shoes. Touch bases with the nursery and see what support they'll give her whilst she's there x
We have spent several months having nappy free time with a potty near by and most often now get to the potty/ toilet in time for wees. Poo on the other hand we are struggling with. She gets upset and avoids going until you put a nappy on and then she has a poo and needs changing straight away. Good luck I don’t there is a tight or wrong way to introduce it.
We have introduced it at key times. Before and after the bath, after morning bottle and bed time bottle when we would typically nappy change. We’ve had a few wees on the carpet 😅 we read one or two really short stories (which I close and stop reading once he gets up) when we’ve had the accidents on the carpet. We’ve got a peppa pig sticker chart from home bargains to help. He looked at it today before bed and said nooo 🤣 think he had just done a wee as his nappy was warm so missed it!