I'm facing the same dilemna you are. I've got a fuel system and have concerns about installing it too.
From my understanding, the O rings are lubricated with a special lubricant but most people use, don't bend over when you do this job, Vaseline.
If you seat them dry, the O rings are nicked and they leak exposing you to the potential of fire in your engine bay. Which sucks. A lot.
You seem to be an adventurous soul. Have you done much shop work in the past?