In my work I normally don't install toilets, but an appliance store I do work with asked me several times to install some because their plumber was out. I installed a couple one piece Toto toilets upstairs, but I used my short Yeats appliance dolly to pull them upstairs, and to take the old ones down. I've always been of the mind that you try to make it as easy on your back as possible. In fact decades ago I built a very portable jack that I use to lift up double ovens. I've actually installed hundreds with it. It's easier than two people.Buck up, when I was an apprentice plumber, I dropped a toto brand toilet down a flight of steps en route to a basement bathroom install.
My boss looked at it, looked at me, and "suggested" i take the rest of the day off....and to call for a ride. He was not happy, those Toto branded fixtures are not cheap.
A few months later I was working in a house, and this plumber comes running down the stairs with a one piece toilet in his arms that's dripping. I couldn't believe it. One slight stumble and he and the toilet would have been toast.