I was just changing the strings on my old Gibson nylon ... I figured it would be a good idea to film it for anyone wondering how to tie the strings on to the bridge. You'll see how basic it is ... the only thing that's really important is that the last little overlap of in the knot happens over the edge of bridge ... on the back of the bridge. That keeps the end of the string from slipping through as you tighten it up.
It's best to tie the first string on, then tighten it up enough to keep it out of the way while you do the others. When they're all loosely attached, start to bring them up to pitch. Nylon strings take a long time to settle in, so don't worry if your guitar keeps going flat. It might take a full day of constant retightening before they've stretched to the max. You can speed that stretching up by giving each a good strong yank around the middle of the string ... pull them firmly away from the fingerboard and then tighten them back up.
The bass strings are wrapped in fine wire and you'll find that in most brands, these bass strings have a floppy end and a stiff end. The floppy end is the one to work with. They're made like on purpose so that they're easier to twist in a knot.
The other end is no problem: just stick the end of the string into the hole in the barrel, leave a little slack and then start tightening them up. I never really have to worry about doing anything special up that end. When you've finished, grab a pair of scissors and clip any excess off the ends.
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