The clutch itself isn't all that terribly expensive. The expense will be in the shop time.
This is not a DIY sort of project unless you have the proper tools to do the job. That transmission is not light. Without a transmission jack that is hefty enough to handle the weight you are going to have a really hard time getting it out and back in again.
At a guess I would say a minimum cost would be in the $1,500.00 to $2,500.00 neighborhood.