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Just put a set of headers on my '01 5.3l. Jacked it up on stands in the driveway to get to the y-pipe bolts and dropped it back down to get to the manifolds. The whole job took about 2.5 hours. Would have been faster with a lift or a pit, but you make due with what you got. Depending on what brand you got, the instructions should be pretty straight forward.
On your other note, I've put in a K&N FIPK, removed the maf screen, Gibson catback dual and Gibson headers. I haven't dynoed the truck, but hp and torque gains were very noticable (especially after the FIPK). One thing I know for sure is that mpg is up just over 4 above stock. It sounds a helluva lot better too!
Good luck.
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