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Down time would be significant. I would start with getting massage from a colleague regularly along with some targeted shoulder strength work that is pretty static in nature. Go with hanging to tolerance from a pull up bar (scrap it if it is too aggravating) along with waiters walks, farmers walks, and partial turkish get ups and arm bars. You can use dumbbells or kettlebells for any of these. The tissues have to be systematically loaded to tolerance to heal properly. With consistent work you can likely avoid surgery. Find a PT or someone near you who is proficient in the use of kettlebells or training. Use the MWOD list on the site, it is free to use.