Simplest and quickest way to change tuners
1. Remove the strings safely. If you got a new set of strings then better cut the old strings but if you want to use it so you can test your newly fitted locking tuners then better carefully remove it and left it in the bridge.
2. Use the spanner to loosen the bushings. Be careful and don't rush. Also it's really easy so just use minimal force to remove this.
3. Turn the guitar around and unscrew the old tuner. Best to get one tuner first and fit your new locking tuners to see if you need some changes or if it's the right tuner in terms of length and/or width.
4. Once you're happy with the fitting as well as angle, etc. of your new locking tuner. Then, just proceed and remove the rest of the tuners and install your new tuners.
5. Always put the screw first at the back to the tuners in place. Then turn the guitar around front facing and put the washers first then the bushings. Tighten it gently using a spanner.
6. Turn the guitar again to double check the screws at the back if it needs a bit of tightening.
7. Once all is set and you're happy with the way it looks and feel, then time to put back the strings or put your new set of strings. You might need a pair of pliers to pull the strings. Remember to angle the hole of the tuners in line with strings and lock/tighten it up before turning the tuners and tune.
8. That's it, easy and straight-forward. Don't forget to cut the excess string and use a cutter.
THESE ARE MY TWO CHOICES: