I started off doing shared care, but I really didnt like my GP, so managed to get the last spot in a special program at the hospitals antenatal clinic. Its where all of your pregnancy care is monitored by the same team of midwives, so you have more chance of getting someone you know for an appt, and at the birth too.
Sorry I dont have more experience with shared care, but I think there are heaps of ladies on here who do, and will be able to help!