1. Before transporting it, please do a little practice session. Get yourself a throwaway backpack, fill it full of heavy objects until it’s roughly the same weight as the doll, then try to lug it up and down the stairs a few times. It won’t perfectly match the weight distribution of the doll, but it will give you a relatively good idea of how far your center of gravity is going to be thrown forward while you’re trying to keep your balance ascending and descending a staircase.
2. I have a WM153A and I carry her in a bridal pose. I would avoid carrying her with her thighs. The leg joints become loose in time so there is a risk of them moving and possibly tripping you up.