How old was your LO when they potty trained, and how long did they need help using the potty- for pee and for poop? What about washing hands?

My 2.5 yo is giving us all sorts of signs that she is ready for potty training, but we also have a 4 month old who takes forever to put down for naps, so I'm dreading starting potty training and having to drop what I'm doing 30 times a day to go help her. But I also know it has to happen some time.