Changing rocker cover gaskets with aftermarket lpg system in the way?

I have searched and read up on how to change my rocker gaskets myself, and have the Ellery's manual to follow as well. All set to have a go at it today, but looked at where everything is, and it seems there are hoses and whatnot everywhere it my way from the lpg system. Something the how to's and the book do not cover. Anyone done this themselves without too much drama? Or should I just bite the bullet and get the mechanic to do it?

Im getting oil drop on the ground the size of a 10c piece at most overnight. Will this be enough to not pass a roadworthy?
Im tempted to have a go at degreasing it all before roadworthy, but Im a bit undure about doing that too in case I get something wet that shouldnt be wet and stuff it up. But atthe same time I do like to have a go and not just throw my hands up in the air and not try. So any help will be greatly appreciated.

Oh and its a 98 VT.