Hi there, Joan!
Welcome to the Disney Parks Moms Panel, and thanks for your great question. I can't wait for you to make magical memories at the Happiest Place on Earth!
I'm delighted to let you know that the Disneyland Resort is very accommodating to guests with
mobility challenges. You are more than welcome to bring your own ECV or
rent one on a first-come first-serve basis per day at the Disneyland Resort when you arrive. Similar to strollers, there will be designated areas outside attractions, restaurants, and shopping locations for you to park your ECV. Feel free to ask the Cast Members at your location if you don't see the parking area right away and they will be more than happy to help you.
If stairs are difficult for you, you may want to look into some of the alternative experiences offered to Guests on certain attractions in Disneyland Park. For example,
Sleeping Beauty Castle Walkthrough and
Finding Nemo Submarine Voyage have experiences that still let you enjoy the attractions without the stairs. Just ask the Cast Member at these attractions if you are interested in these alternative experiences.
I hope this helps, and have a magical day!
-Jennifer