Intake manifold gasket should I do the head gasket

I have a 2004 grand prix Gtp that I am going to be doing
the two intake manifold gaskets on which I am
completely comfortable doing. I've been told that I
should do the head gasket as well. I have found out that
doing the head gaskets on this car involves needing
other tools and the possibility of ruining parts. I bought
a set that has every gasket already so it's not a matter of
money. My last question/concern is if I should do every
other gasket/O ring etc. If I don't need to take the part
off or anything that will make it necessary (fuel injectors
for example) Thank you in advance.