label every hose, and what it connects to. masking tape or duct tape works fine. just start at number 1 and keep going. Buy a good manual as well. You might be better off paying some one. Head gaskets are a big job, and if you are inexperienced it is easy to get overwhelmed and then you may never finish. more cars go to the junk yard because some one couldnt/didnt put them back together.
I usually advocate changing them in pairs, but I dont always do it. Just put a head gasket on my car last month. did the passenger head only. once you have one head removed its only another 26ish bolts to do the other side