Installation Time & Costs

[Catspaw]

Greetings all.
When I’m ready to add horsepower to my Lady, I’ll have to decide what upgraded hardware to buy. After that, comes the inevitable decision of doing it myself or paying a pro.
So … these questions, please:
-- Is installing a new exhaust system a bolt-off/bolt-on job?
-- The cold air intakes look like something this old shade tree mechanic can do.
-- Headers, are probably out of the question for me though. :O(
Comments please ?

Next, if I do go with a pro, roughly how many hours labor should I expect to pay for each of these change outs :
-- Headers?
-- Cat back pipes + muffler?
-- Hi flow cats along with cat backs?
-- Cold air intake, filters in the engine compartment?
-- Cold air intake, filters down in front?
-- Oil Cooler?
-- Cost of Tuning