yeh there easy enogh to fit, as long as you have the right one for the car. just take the corner of the dash off and the plastic upright bit off, unscrew the cable that goes to the wipers and just unplug the old one and plug the new one in the same.
as i say just have the right one for the car, for instance my series 2a had a mini set-up some how!?! and wondered why i could not find a match under series motors. but hey, thats the beauty about series,most things fit them :D