apart from checking out former students, interpreters competency, you really need to be clear to them (and to yourself -for defence incase they question your needs (which they shouldn't!!, and if they do , you have grounds for compliants)) just be very clear to them that you require interpreters, notetaker as they are your needs. Keep in mind, use word Needs, like you need them. I dont like the word, its makes us seem 'needy' but thats just today's conventional politics regarding disability- dont go there)..
so
do what others mentioned as above, but also be sure above al, be Really clear fro day one. and then it should go smoothly.