Anyone with experience lowering/raising a tabernacled mast?

I am planning to lower my mast and change the standing rigging/paint it. I'd like to do this at the dock (I'm on a side tie with lots of room fore and aft). The boat was set up for Santa-cruz and has a tabernacle designed to lower forward.

I'm not finding much online to describe the technique

Can the boom be used as a gin pole? Can the shrouds be left attached (loosened)?

Also, anyone have recs for purchasing replacement standing rigging? Seal's Spars and rigging seems to have a lot of experience with Santana's.

Any help really appreciated!

Mike