Josh,
I don't have headers on my truck but for $450 to install I know I would do them myself. I'd image it wouldn't be that hard if you jacked the front up, remove the tires and then sit it on jack stands. Then remove those plastic inner fender insert pieces(whatever they're called). Then the exhaust bolts should be right there. Of course you'll have to remove the mid pipe too. To remove the midpipe you also have to remove the back support bracket for the tranny. Which means your gonna have to support the back of tranny with a jack stand or an extra jack while you do the exhaust. Screw paying $450 even if it takes you all day to do it. Remember to torque all the bolts back too. If you need torque #'s I can look them up in my service manual. Let me know.
Kevin