It should be pretty easy to do. There are only a few screws you would have to take out to split the stock apart and the clips holding it together. If you look around here for the ATI stock conversion you'll find out how to take it apart and it has pictures. But it's pretty easy to do so it won't be that big of a deal for you.
Well take down of a C9 is going to be different than that of a carbine (which is what I believe they are talking about). There is a sticky in the pistol section that shows a complete takedown of the pitsols. Replacing the mag release spring is very simple, and once you know what you are doing can be done in a minute or two.
okay i figured itd be easy. ive stripped my pistols completely including the trigger mechs and it all was pretty basic. im still a lil stumped on what all with be coming in the mail but im sure ill be able to figure it out...if not...ive got tthe best forum to turn to. :]