Very carefully. Or have a chiropractor on retainer. I think it was Mark Twain who said the older my father got the smarter I became. Or the heavier my equipment got; take your pick. Bending your knees while lifting objects from the ground helps lots./ The next day you know if you bent your knees. Depending on your creatitivy the job can be a bit eaiser. My Cat/with the attached by umbilical can be daunting. If you live upstairs, getting things there, can be fun. Not to mention, the jounce of the dolly on each stair, is bone jarring, to whatever is coming up or down. Get help if you can. Your equipment and back are worth it.
