Quoted from Marco1973:With the right tools it is a really simple operation. Desoldering pump and soldering tool. There are on Pinside lot of threads about it, I ordered exactly from the USA the tools I'm using. For you will it be easier and cheaper in comparison of what I did.
Not so fast. Yes, you definitely need to have good tools but you also need practice. I wouldn't recommend learning on any of the original Williams/Bally WPC boards or the Rottendog replacements. They are not as forgiving as other boards and you need to be comfortable with board work before working on those. Some had components with the leads folded which are a bit more difficult to get cleanly out. difficultly also depends if you are trying to save the old part or not.
I've gotten in too many WPC boards (both original and a couple Rottendog) that had damaged pads, traces, and through hole plating from prior work. That takes additional time to repair and costs more than having someone do it that works on boards all the time.
That said someone can definitely learn and do it. Just be extremely careful on any of these boards.