Did that when I just left, it can be bloody hard graft and you have to be careful as some publicans will offer you a pint as a thanks if you drop the stuff to the cellar for them. Normal kegs are not too bad but when you get to the 36 gallon ones (Timmy Taylors came in these) then it is a serious bugger getting them in to a cellar with no hoist.
Did you do the job long? Were you double manned??