Not strictly a load-in, though I still remember the Edward's no.8 experience, but I had to get my mum's piano into the house she'd just moved to. So it was up 3 steps from the road - just about fitted through the door but the previous owner had built a little interior porch, which I had to dismantle. I'd wisely hired piano movers but there were only 2 of them - one my sort of size and the other was enormous, which was most helpful for what was to come.
We got into the living room, when my mum said "it needs to go upstairs" (she's a piano teacher so wanted to give lessons in the spare bedroom). Now this was no ordinary piano, it was an oak Pfieffer overstrung with oversized cast iron frame and weighed close to 400kgs... And it didn't fit the staircase, though once I'd taken the stair-rail off it did, just. Luckily, I reasoned that it wouldn't go round the right angle at the top, even if tipped on its end so I took off the banisters just in case. I put a climbing rope underneath it, we lifted and the enormous bloke got under too, while me and the other chap heaved and pulled it onto the landing.
Strangely, when my mum moved house again a few years later that piano moving firm no longer existed!