Get an engine gasket kit from the dealer. It will have everything you
need. Replace every gasket you can. Nothing is worse then going back in
to replace a bad gasket you reused.

If you use a small, 12 point socket, you can get the head bolts loose
without removing the cam. I just did it 2 weeks ago. The problem is the
cam blocks the head bolts from being removed all the way out. You
should replace the head bolts when removing the heads. They tend to
stretch.

I removed the camshaft (not really a big issue anyway, just don't let
the shims fall out like I did) after I removed the heads. I didn't have
a cam pully holding tool (that I now see Amazon has for about 15 bucks)
and I could not get the pullys off.

You don't have to remove the exhaust manfolds, but you will have to
remove all the pipes and the cross over. When reinstalling the heads,
make sure the crossover is correctly back on before you bolt everything
down.

Put a new timing belt, all pullys, and water pump since you will be in
the area.
And get the service manual.  Getting everything back on and lined up
correct is real easy when the book tells you what marks to line up.

And mark all the stupid vacume lines. If you misplace just one line,
you will be spending hours trying to track down strange engine
problems.