Glad to hear you've finally had a chance to get into it, at the same time I"m sorry to hear you had to go into it so deep. That said, one thing I always tell my customers is that when you get so far into a repair, there are things that ought to be done while there. At the moment I've got a D6 I've got to go in to replace the brakes. While there the steering clutches are going to be checked, and gone through if needed. Given that they have to come out to get the brakes out, it doesn't make sense to do the job halfway now and have to go back in later, at twice the cost. True I love job security, but I hate to make it happen by being slack.
In your case, when your doing the work yourself, you might get away with not doing the clutches if the stack height is within specs. Now if you plan to use it a lot, and the stack height is close to being worn out, then it would be worth your time to do them while there. By the same token, if you"ve got over half of the life left, then you might be good just letting them go, and they"ll be good for quite a few years to come.
As far as taking them apart, that typically requires a press, and a "special tool" (ie- a plate with holes in the right places) to get them apart safely. Without the right stuff, or the capability to make the right pieces, you"d be better off taking them to someone that has the correct tools.
Parts wise, I think I have posted this link before, but Offroad Equipment Parts in Tenn has great prices on both aftermarket, as well as OEM CAT parts.