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My $.02.
1. You can typically pay someone for less than you can buy the batts. Before they or you install batts, use canned foam to seal any wire holes or pipes, etc. I prefer un-faced batts with polly vapor barrier but since you only have one bay stripped, it really doesn't matter.
2. If it were me, I'd strip the entire garage ceiling and warm walls, add wiring for what ever I could think of for future and have it sprayed with closed cell foam. They will spray to what ever depth you want. If you fill to the depth of the joist, you'll get something like R50. Walls you can get up to almost R30. It's usually 2.5 - 3 x the $ of doing batts.
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