learning to solder and desolder is pretty easy: you can certainly learn from a youtube video.
If you just want to solder this one thing, the cheapest option is to borrow a setup from someone else, but you can get a "firestarter" type soldering iron for about $10. Soldering braid will help in removing the switches, but isnt strictly necessary. A small amount of solder is also required. I recommend getting some from someone to buying some: it'd take such a trivial amount to solder just afew switches.
Also, if you live in the same country as another GH'er, someone might offer to replace the broken switches for you. Not sure if it's worth shipping your keyboard twice, though.
And if you plan to be doing some soldering after this, I would use it as a good opportunity to invest in some at least decent equipment.