I must say the guy gave me the willies standing up there struggling with that unwieldy liner with no strap, no scaffolding, nothing. Just him and empty space. He was a nice guy, too. I didn't want to find him splattered on my walkway!
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Unrolling the liner straight on a flat surface is what I did. If you ever worked HVAC you know how straight you can unroll pipe. Then we fed the straight pipe down. The way he did it isnt the best way for straightness. No wonder there are bends and kinks. Maybe this is how they do it. Not the way I would. The guy does have some guts though.