Do it yourself if you can, it's not hard. Just get organized and go slow. There are rebuild services, but they can be pricey. The throttle shafts are known to wear on Q-jets and can cause a vacuum leak, the solution is to bore and press an insert in. If your throttle shafts are worn it might be better just to get a new carb. One word of caution, remanufactured Q-jets are know to have problems most of the time.
Either rebuild yours yourself for the price of a kit, pay somebody to do it or buy a new carb.
I'm not a fan of the Edelbrock 1405/6's. This is my new favorite carb, and I've had them all:
http://www.summitracing.com/parts/SUM-M08600VS/
It has alot of things you can't get for the price and it's very tunable. But most likely you'll pop it on, adjust the idle/air mixture and just cruise.