defo dont drill holes - you only need to drill the holes to put in the phone holder. Get a bluetooth kit - I have a nokia bluetooth kit which is perfect but would reccommend one of the Parrot bluetooth kits as they are compatible with almost every phone. Nokia only work with nokia phones so you have to always upgrade to a nokia phone.
Get a professional to put it in - especially considernig it needs to be hooked up to the ignition of the car and also mute the radio.