Are you sure it is a head gasket and not a leak some place else? A shop test the coolant for exhaust gases and do a pressure test.
Download the service info from the link below:
http://oregonstate.edu/~tongt/camry
Make sure you have all/most of the tools, parts, gaskets and way to get to the auto parts store. You will need a torque wrench.
If you are just pulling the head, you may be able to leave the exhaust manifold and intake items attached. Problem areas may be getting the crank pulley bolt off (you will need a way to lock the pulley), removing valve springs (need a spring compressor), pulling off old valve stem seals. The seals are buried in the head.
Pick up one of the pens just yards use to mark parts. Align engine crank and cam at TDC, mark cam gear locations so you don’t need to guess upon reassembly. Be sure to use the locking bolt on the came gear and remove afterward (see manual). Keep separate each valves shim, shim holder and other parts or you will be needed to readjust the valve clearance up assembly.
Mark any wires you remove, put bolts in plastic bags and mark them, if you have a digital camera take photos.
When removing the head bolts, reverse the installation procedure. Don’t just back them out all the way one at a time.
One issue would be what to do if the head is cracked or warped.
If you living in apartment, check with (or at least get a feel for) if management has issues with auto work. You can always leave the hood on, closing it when not working and no one will know the difference.
If you know what you are doing the job is pretty straightforward. If first time, plan on taking you time and having a few setbacks.
The radiator is an easy replacement as is water pump (get all the gaskets with pump), also get a new T-stat.
Shop around for parts, Toyota will charge the most. You can buy aftermarket seals that are much cheaper then Toyota.