soldering gun?solder?
If you have never soldered, I would suggest working your way up to mic mods by building a bunch of cables or something easy. You don't wanna learn to solder on something expensive or breakable.
For solder, unless things have changed in the past years since I picked up the iron, you will want to use thin rosin core solder with a high silver content. Acid core is for plumbing, rosin is for electronics. The rosin acts as a flux (which allows the solder to flow). Don't use a gun, get a low-power iron with a fine tip for small electronics. When you first heat up the iron, you will need to "tin" the tip of it with a bit of flux & solder to get things started. You might want to pick up a de-soldering tool ("solder sucker") or some braid in case you make a mess on your project.
Practice practice practice! Remember delicate electronics can be rather heat-sensitive, so you may want to pick up some small hemostats or cross-locking tweezers to clamp in between the spot you are soldering and the component.