I unstepped my mast with an A-frame that I built.
When you say "remove clevis and cotter pins", it sounds like you're asking whether you need to disassemble the entire shroud/deck attachment hardware. That seems like overkill to me for the purpose of getting your mast down. Once you have the rings or whatever out of the studs, you will be rotating the turnbuckle
(NOT the shroud's swaged stud) to disconnect the shroud from the deck. Regardless if whether the shroud stud or the deck stud comes out of the turnbuckle
first, you're done at that point. No sense wasting valuable crane time to get everything else off.
Because of the arrangement of my A-frame, I did undid the forestay last. I undid the lowers before undoing the uppers, mostly out of fear.
Something I did not do but would recommend. Label each piece of standing rigging
before you undo them. Also, once all the pieces are off, tie them securely to the mast. Otherwise it's like Cthulhu means The Terminator on your deck.
I also have a deck-stepped mast. When pulling the mast, instead of removing it from the boat right away, I lowered it onto a 4-in-high block placed right next to the mast step, so that I could unplug the wires that went into the mast.
Have you figured out where you're going to put the mast once it's down? I did my unstepping at the dock and basically rested the mast on the bow and stern pulpits, lashed down so that it wouldn't roll or slide off. I lowered it so that the masthead was sticking off at the stern, which happened to be end easily accessed from the dock, which was great because I needed to do work at the masthead and could do it standing on the dock. Also, the mast, despite being pretty stiff, sagged in the middle; since I was going to be leaving it down for a couple of weeks, I arrange for some support in the middle.
That's all I can remember.