To your question about PTO clutch.
It probably has a double disc clutch.
When you push the peddle in half way it disconnects the drive disc, all the way then the PTO disk too.
It might come as a complete kit.
The real trick is to be able to move the two pieces apart while keeping them aligned so they go back together easily.
A floor jack or engine hoist or some other way to roll them apart is a must.
We will need pics when you do it!