Assuming we're talking accessory drive belt (and not timing), then the job is not hard to do yourself with some basic tools. Also, if that belt goes, you'll be in need of immediate replacement for useful things like water circulation and electricity, but it won't DAMAGE the jeep, you just won't be able to really run it until repaired. Again, depends on what you're willing to pay and how much it matters to you that the shop perform the work.
Dan
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2005 Silver CRD Limited

245/75R16 GoodYear Duratracs
Fumoto drain | ProVent CCV Filter
Stanadyne FM100 filter | Cummins fuel pump
GDE Eco | SEGR | BoulderBars | FrankenLift | Frankenskids