A word about soldering If you think you can solder, then don’t!
Okay, this sounds silly but most people who say they can solder are actually very bad at it.
If you KNOW you can solder really well, that’s great. If not, practice until you can! You should be able to tell if your soldering is good by looking at what you’ve soldered. If you’re not sure, have a look on the internet for videos of soldering so you can see what a good soldered joint looks like. Then keep practicing until your soldering is as good as what you’ve seen.
Most of the solder joints in musical instruments are either very small indeed or even smaller than that. You need to be able to solder very precisely and this needs a good soldering iron.
Lead-free solder Don’t use lead-free solder on older products which used normal 60/40 tin/lead solder. Normal solder gives a nice, bright, shiny joint when done properly. More recent products use lead-free solder and this should be used when working on these. Lead-free solder gives a dull-looking joint which looks horrible but there’s nothing you can do about it. Again, you can find videos of lead-free soldering on the internet.