For the vac lines take lots of pictures, or label each line with a piece of tape and number, and make a note of where the numbered line connects to.
Do you know which head needs the gasket replaced on?
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