Changing strings on a double locking trem. How I do it:
First principle: 1 at a time!
Start with the low E.
String out:
Undo the bolt at the nut and take the locking block off
Unwind the tuner peg
Undo the long bolt at the bridge that is holding the string in
Take the string off
Unwind the fine tuner all the way, then back in two full turns
String in:
Cut the ball end off with pliers
Put that end in the bridge
Tighten up the bridge bolt/clamp at the back
String guitar as normal
Tune up as normal, remembering to stretch the string
Do the same for the A string
Then lock those two strings using the locking part at the nut.
Once you’ve done them all, take all the nut locking parts off and play the guitar for the while – do some bends, give them trem a wee wiggle etc.
Keep tuning using the tuning pegs
Once the guitar has settled down, lock all the strings at the nut.
Now you just adjust using the fine tuning nuts on the bridge