There is no need for referral.
Yes. Depending on the complexity of the procedure you need to pay a small gap which is payable after the result becomes available. You will be offered other options, including referral to public system which there is gap-free.
Your doctor will hand you a referral note to get to the reception, written the exact amount of gap, and the needed time, then you can choose any available time which suits you. You will be booked with a nurse for the wound review and dressing change, usually 2 days after the procedure.
The 3rd appointment, again with a nurse, would be appointed on the procedure day for suture removal which depends on location of the lesion and procedure.