Its not too bad after you've done it a few times. You just do the two ends first then the middle ones. The main table has a machined reference and so does the sliding table so you just use calipers to measure the gap. Once I've got my double mitres machined up you just do a 5 cut test to make sure the mitre is running true to the blade.
It was way more difficult on my old pk which had an extended slider and 12 bearings to adjust. On that you had to level the carriage for the sliding table, and tension it against the main supports to stop it flexing when the sliding table went to one end.