I'm a CCNA so we had to learn alllll about it. Very boring.
Finder, i just separate and twist. hold the servo in place and then just turn the wires until you end up with a really tight twist. Want it to look like this:
And as far as ferrite rings, my understanding is that they stop high frequency signals getting through, so you just get the servo pulse and not other crap that gets picked up. I'd put the ferrite on any digital servos, and ESC wires (especially ESC wire) and twist em all. more the merrier as far as things which improve signal quality.