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If they are shorty headers it will be fairly easy. LT headers your are looking at around $600-$800 for install. In most cases the engine needs to be lifted a bit. It's a p.i.t.a.
I paid about 550.00 for the install of my LTHs at Meineke. Yes, that have to lift the engine a bit. You can't do it yourself unless you have the equipment to do that.
No lie, it is a PITA to do headers on your back, but doable. No special tools required as all you need is a jack to lift the motor about an 1". I may have considered $250 for an install, but sure as hell would not pay the kind of money listed above. Here's a write up on the Kooks install but pretty much applies to all L/Ts.