i unload the flip over tub, then stand centered and close to the opening and have the tub to the side with the back of it facing me, i grab the seat brackets towards the middle attached to the tub and pull it up and onto my legs above the knee with the front still on the ground, then lean back and lift it all, then i swivel all of it to the opening and then set it in.
this allows your legs to do the lifting.