I can't count the number times I've moved stuff from one house to another. We haven't had to do it ourselves for a long time, but we changed residences more than a dozen times the first few years we were married, and both of our children have moved that many times since they've been on their own. It adds up.
Because there are stairs on both ends this time–upstairs, downstairs–we are hiring movers to haul the really heavy stuff, and only the things we can carry in various cars are our responsibility, which suits me.
I don't mind helping somebody else; me, I'm not moving again. Only way I'm leaving this house for another residence will be feet-first ...