yea...
you not got a full tank have you?
should be fine at around 3/4.
if not jack rear end up so it leans petrol foward,
Its not much effort to take it off. just the fact it will have loads of roadcrap around it)
Carnt remeber, Is there two screws under the petrol cap? Remove them. and theres 2 big clips in wheel arch(remove)/push down out of way. and one smaller one.
also, when remove, might aswell get some sort of rust protection around the actuall bodywork of the fuel filler(arch side) as it may be a rusty place in years to come..