How difficult is this?

[KiltedBanshees93GT]

Question,
I am still trying to get my car back on the road, (not a lot of money coming in, lots going out) and I need to know what I can do, and what I will need a shop to do.
I am decent with a wrench, but havent really torn into an engine/tranny before. The situation as it stands is thus:
(my theory) I had my tranny rebuilt about 2 years ago, clutch and cable replaced. I think that the cable was bad, (or something). The cable began to bind, which started stressing the tranny to the point that it was grinding various gears. (I think) the stress was not only transmitted to the clutch, but to the crank itself, causing the harmonic balancer to let loose.
As it stands now, I have a binding clutch cable, where the pedal will hang loose at the up position. A transmission that is ok for about 5 miles before it starts grinding switching gears up and down. And a balancer that is loose and wobbling on the engine.
My question is how difficult is it to swap the balancer out, is it something that can be done without too much blood sweat and tears.
How much am I looking at for the tranny and clutch? And finally is there any way to tell if the crank or bearings have been damaged by the brief time the car ran w/ the bad balancer without tearing into the engine?(2 min total maybe)
Thanks in advance,
J