its worth noting that when you put the drum back on (if you have drum brakes) that nut only needs to be finger tight - the one with the mole grips on it "Take the pin out and the cover off should have a large nut behind that, won't be too tight so just need to take that off"
It should just be tight enough to allow the washer behind it to be easily moved with a screw-driver. If overtighted, the wheel bearing will overheat and you'll hit a tree.
James