Do it yourself. It isn't all that difficult at all. If you were closer I'd give ya a hand for a few beers. I'd also purchase a camber and caster kit so you can get your alignment right after the lift. To install, jack the truck up and undo the 3 bolts at the top of the strut mount. Just like the 3 on the lift kit. Use a spring compressor to tighten the spring so you can get the additional clearance, as well as taking tension off of the mount to allow you to spin the top mount to get access to all 3 bolts. I would try installation without removing the bottom strut bolt to see if all this could be done. But from my experience removing my strut assembly many times trying to get the exact stance I wanted, I would try this route before completely removing it. Also if you have air bags you may not need the spring compressor, just deflate the bags. And get an alignment, it will probably be pretty far off.
Victor