The diagnosis has been made. You've eliminated other possibilities with the symptoms.
Regarding the repair, we don't teach appliance repair here so much as we help you find out what's wrong. There are specific repair manuals you can obtain that will show you step by step how to do the repair. Even technicians use these for reference when they are inexperienced with a particular brand. These manuals (and DVDs) are available here on the website. If we taught everyone how to do things for free that we spent our working life learning, we would be out of work as technicians, right?
Replacing or even looking at the clutch requires you to:
Remove the cabinet
Remove the agitator
Drop the motor, then the transmission
This is why the repair manuals were designed, to prevent mistakes. I highly recommend that you get the clutch kit first to avoid tearing into the machine twice for the same thing. I also would replace the drive coupling simply as preventive maintenance, to keep you from having to go back in there anytime soon after doing the clutch repair. Again, we are talking about relatively cheap parts to fix this problem.