Random Tips

I will update this periodically as I have more to add.  If you have any good tips, feel free to share them!

When installing a retainer bar on a Floyd Rose style system, use the outer two locking pad screws on the nut to align the screw holes.  Their centers should be equal.  I usually use a ruler that has the same markings on both sides and is the proper width I need and just line up the same marking on each side of the ruler. 

If your guitar has ringing after you mute the strings with your hands, foam under strings behind the nut will reduce this.  The foam shouldn't be too hard or it will play with your tuning and possibly pop the strings out of the nut.  

Always push with your file or you will ruin it.  Keep your file clean as well.  Running your file over ordinary blackboard chalk before using it also helps to keep metal debris from building up in it.

Oil or lubricate your cutting tools to keep them sharp longer.

Use linesman pliers to cut guitar strings.  They aren't the cheapest tool but they provide good leverage for cutting strings and won't get all nicked up the way most wire cutters will when you use them to cut the steel core of guitar strings.