Not alot of information to work from here, I think a good response would factor in your past experience, access to tools, lifting equiptment, second set of hands, access to a repair manual for torque specs....
Based on your question, my guess is that you should pay the shop.
Question; what brand are you going with? Kooks or ARH or equivalent I hope?
Believe t or not, but headers are NOT created equally. Heard of, and experienced my own buyers remorse, trying to go cheap.
Adding to the topic through... there are a few things that are easy to do, while installing headers that will also help future work, performance and reliability.
1. BMR Motor Mounts; lots of info here on the forum, i love mine, and many others do. Great improvement in throttle response, and more clearance for the headers.
2. V Bands. I have heard of so many people complaining of exhaust leaks, and when i had them myself, I decided to have a local muffler shop weld in some V band clamps... this makes future work a breeze, and no more leaks!
3. Wideband bung... if doing Vbands, have them weld in a bung, upstream of the collector for a future wideband.
4. Spark plugs... easy access right after new headers are on.
Hope this helps.
and if not... well, at least it was cheap
