Just to give you an estimate on the far upper end of doing a job like this, I had my mast taken down last year and completely overhauled That included just about everything except for the mast itself, the spreaders and repainting but did include cleaning up some corrosion. New sheaves, wiring, standing rigging, fasteners, turnbuckles, halyards, anchor light, steaming/fore deck light, etc., etc. Since I'm in my 70s, live 2 hours from the marina and had only a small knowledge of serous rigging work I had the refit done professionally. The final price came to about $17k. Just the labor costs were $5,000. That's right, but I wanted a top notch professional job that I could rely on without worry. Not saying that this sort of major rigging project could not be done by an owner, I just didn't feel qualified to tackle something that I needed to depend on for my well being.
Here's a short video of the mast removal if you're interested.