I paid a 'pro' (he's done hundreds of gear swaps) $200. to install my 3.55's. I got a guarantee against vibrations, etc. and never had a problem. Total was $230. Fair price considering the labor and chances of screw-ups avoided. Dealer prices are always insane but you may be stuck due to your location. Look around for a quality shop that might do the install; it's not brain surgery but easy to get wrong and you do need the special tools mentioned in an earlier post.
The 3.73's won't hurt top end much. You'll see about 2400 RPM or less at 65 mph compared to around 1800 with 2.73's/3.08's. Actual RPM's will partially depend on your tire size but even at 2400 you'll not do any real harm and the increase in low-end acceleration will amaze you...feels like you added another 75 HP. A highly recommended modification.
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