Hi, I've tried tuning my rear derailleur on my own according to this video: https://www.youtube.com/watch?v=ZTprZHCwoNc (first time doing it)

And yet, after finishing the step of adjusting the high limit screw, I can't by any means get the chain to move up to the low gear. Here's what I do:

1) I turn the barrel adjuster so that it goes in, loosening the gear cable
2) Loosen the anchor bolt and tighten the wire almost as far as I can pull
3) Take off the wire tension by pushing on the derailleur to put it in the easier gear and then pulling the wire out of the wire stop
4) Setting the high limit screw so the chain can come to the smallest (highest) gear easily
5) Reattaching the cable in the wire stop
6) Making sure the chain still falls on the smallest gear

And it's at this point that I can't get the chain to move up to the lowest gear. Intially when I shift using the gear shifters it clicks all the way easily and I see the wire tightening, but nothing happens to the chain. Then I keep turning the barrel adjuster so that it goes out, tightening the cable. And still the chain doesn't move when I shift to the lower gears with the shifter, and now, the more I loosen the barrel adjuster (moving it out), the more difficult it becomes to use the shifters, until it becomes really difficult to even click one gear lower. And yet the whole time the chain doesn't move.

I would appreciate any advice. Thanks.