See this thread for answers to your questions, plus much more. 
Ahh, thank you very much JD, that is practically everything I needed! haha

The risk of using a cheap soldering iron is that you could damage your board because it gets too hot. Another option would be to get someone like Margo to do the replacement for you. That way you don't have to buy any gear.
I did that for some SMD work I needed done here in the states. It was far cheaper to have TheChemist do the work than to buy a hot air rig.
Just a thought.
Righto, thanks, it's something I shall consider looking in to.
I would say go for it with a cheap iron. I used them all the time before I got a Hakko. Just don't leave it in contact with the joint for too long after the solder has melted, and you won't overheat or damage anything. And even if you do damage the joint (ie. burn the pad off the pcb), any of the skilled guys here can work a fix around it easily.
Good to know! I shall give it a practise test first so I get the hang of it before potentialyl destroying my keyboard

I got a cheap $50 iron with temp control and it works just fine. Probably modded 5-6 boards with it so far, and some of them were swapped multiple times.
Fantastic
I would say go for it with a cheap iron. I used them all the time before I got a Hakko. Just don't leave it in contact with the joint for too long after the solder has melted, and you won't overheat or damage anything. And even if you do damage the joint (ie. burn the pad off the pcb), any of the skilled guys here can work a fix around it easily.
Yeah, spending $100 for just 4 switches is silly. Just grab something cheap from radio shack and it will be good enough to get the job done - who cares if the iron doesn't last forever. Or you could do as some others said and pay someone else to mod it.
Yeah, that's why I was a bit hesitant. I think i'll probably just get a cheap iron an dbe careful with it, given the fact that shipping costs/time is probably going to outweigh the benefits of having it done by someone with experience.
i use a 20 dollar "voltage controlled" hakko. when i can find a link of it somewhere i'll post it here, works great.
Thanks, would be appreciated

otherwise I shall just be going for
this