Either do the job yourself, or pay a shop to do it that will stand behind their work. What happens if the yahoo you don't really know does a crappy job?
It's really not that difficult to do it yourself. It'll just take longer. All you need is jackstands, a good jack or two, and a socket set (impact wrench will help).
As for what clutch to get, Centerforce Dual friction.
It's got twice the holding power of a stock clutch.
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351W 89 Mustang GT Convertible