matty,
it is fairly easy do as i changed mine about a month ago,
the drain plug is pictured in the haynes manual, but it took me a while to find it, from what i remember it is white nylon and looks like a wing nut !nothing like as i was expecting,
i had to jack it up to get underneath, then lower it to get all of it out, i think it holds 3.5L which cost me around £30 from reno,
one thing i would say is make sure you get the right oil (not the one with fully synthetic written on it) as i was sold a litre of the wrong stuff, so i drained it and put in the right grade.
hope this is of use to you !