Removing head, any safety precautions

Hi, i had engine trouble with my hijet a year ago. got it compression tested and it was down on one cylinder. Got a replacement vehicle , a baby arrived and the van sat outside my garage for a year.
Now I have just started to sort it, I am going to take the head off to investigate further. I have the workshop manual and some info from previous posts, but what I would like to know is if there are any precautions to take.
If the fuel rail has to come off, do I have to shut off a fuel valve anywhere and as the van is also LPG anything that I need to do with that?#
Thanks in advance