Im a mum of 4 and potty training my youngest (2yo) atm. We found with his siblings that they tend to pick up using the potty fairly quickly when running about naked but once pants/trousers come into play that’s a whole new skill to learn and it can really throw them. As can car journeys, changes to routine (school holidays), illness, moving house etc. So we treat each new skill as its own stage. So atm, I’m just teaching him how to take off and put on his own pants so he realises there’s another step involved. Then once he’s got the hang of physically doing that, I’ll show him how to do it by the potty for a while, followed by a wee, so he can connect the two skills together and then
he’ll figure it out. I might even skip pants entirely for a few weeks like I did with his brother. Sometimes it’s too much to take off and they give up. He used to take off ALL his clothes at first because he just found it all too much. But he got there eventually
they all figure it out in the end.