For me, I used the stinkiest stuff to hand-feed and was just really patient. I started with silversides.
I also think I might have tried tongs before fingers - smaller looking and less intimidating. I can't fully remember but that might be a good starting point.
The ropes liked to go to the surface anyway, so I'd just put a piece in my hand, try not to move at all and be patient. There was always a bolder one and that helped. Once they got used to it over time it was easier, and I could move around more.
I did get my Polli to eat out of my fingers also, but she was really pretty outgoing and also liked to swim a bunch. I never got any of my other polys to do it, but also didn't really try with them. I had a tall tank - so if they weren't coming to the surface, I wasn't going to bother.
Here's the Polli trying it for the first time. (Sorry, not a great video - hard to film and feed the fish at the same time)