the only "speciallity" tool i guess would be snap ring pliers. i think you can do it on car just as long as you can get the snap ring off which is a little tricky when you cant see it. i did mine while i was redoing my whole system so the compressor was out. try to avoid disconecting the compressor from the gas lines because you need a recharge if you do and depressurisation might cause problems. the last time i did this was about 4 months ago on my previa van on the car. one thing to be carefull about is that there are shim washers that you need to reuse from the old clutch because the new one doesnt come with them. dont loose them, ithink they are under the first plate you take off. if you have any other Q`s just ask im happy to help