You shouldn’t need to remove the FD to remove the clutch. Since you have the trans out you should be able to remove the bolts that attach the clutch to the FD driven plate, then lower the clutch out the bottom of the bell housing.
Yes, you need to use a 5/8” open end wrench to remove the nuts that attach the FD to the crankshaft. I don’t recall needing a special wrench, but it can’t be too thick.
And yes, the FD would need to be removed before removing the bell housing. Part of the housing goes down between the FD and the block..