hi, :wave:
i have found the easiest way is to find where they are going to the toilet (hutch or house?) they do tend to go in the same place once they choose an area. then move a litter tray to that place, its actually quite easy but don't keep washing the tray too much, leave a little of the scent there so they know where to go back to.
i also keep some hay within reach as they do like to 'munch while they go'! :lol:
they are clean beasties and will soon get the hang of it.