5.9L Magnum questions

Yes, requires the tool. If you're careful, you don't need the tool for removal. You'll have to be very careful not to nick or gouge the bores taking them out. So, if you're taking it to a shop for a hone and clean up, just have them do the cam bearings too.
^^^ this right here.

if you're rolling to the machine shop to have other work done anyway, have them bust out the cam bearings drop the cam in do the freeze plugs/galley plugs etx.

it'll probably be cheaper than tool and two sets of cam bearings (you'll gack at least one getting them in, so you'll buy two sets).