I've never worked on a K-series motor but this is how it's done on a B-series:
1. disconnect all hoses, harnesses and sensors that may not allow you to lift off the head.
2. take off valve cover and remove timing belt.
3. take torque wrench and loosen up head bolts
4. make sure the bolt in the bracket from the intake manifold to the block is out so the head can be easily taken off.
5. have a friend help you lift the cylinder head straight up off the block.
(watch the TPS sensor and IACV, on a b-series it's easy to smash them up against the firewall, I'm ASSuming you won't have that problem with a K-series cause the motor is spun around, but still be careful)
6. If this is the first time the head has ever been taken off it may smell a little weird (not really a step just letting you know)
7. remove old headgasket, (I used copper sealant on mine, you can pick a can up at autozone or pepboys) place new headgasket on (have a friend help you. Make sure the head is properly seated on the block and that everything lines up.
8. Find the correct torque specs on the head bolts for the RSX motor (you should actually do this before you even start taking the head off)and the correct sequence to torque down the bolts with a torque wrench. I don't know if theres a new HELMS or Cilton's manual out yet for the k-series or not but there should be.
9. Torque down all head bolts.
10. Put timing belt back on and make sure the timing is correct.
11. Reattatch all hoses, harnesses and sensors you may have removed in the begining.
12. Add any anti-freeze/water solution that may have been lost when removing radiator hoses and you're all set.
If you don't feel comfortable doing it yourself then it's probably best to have someone who does or a dealer do it for you. I don't think I forgot anything but if I have and someone catches it please post it up. I personally don't know too much about the k-series motors but I've heard they don't use a normal timing belt and they can be a bitch to work on if you don't have experience, so I would recommend having the dealer do it, yeah it may cost some $$$ but it's better than risking your entire motor because something was done wrong.
Also Cometic may have a thicker headgasket out for the RSX, not sure though check out
www.cometic.com