Ugh, drywall lifts are a total game changer. I used to wrestle sheets into place with my husband, and the worst part wasn't even the lifting. It was trying to tape and mud a ceiling while your arms are completely dead. Never again. I learned that lesson the hard way too.
Ever get that shoulder cramp where it locks up near your neck? I was mudding a ceiling corner once and my arm just quit. Had to stand there like a statue until it stopped twitching.