Hi cant give you advice on size as i was a 32a and had 400cc unders but as for nerves i dont think anyone was as nervous as me i was in tears on many ocasions thinking something was going to go wrong i drove my OH mad! Im 9 days post op now and can honestly say theres nothing to worry about with the op and just make sure you can take it easy afterwards. Maybe go discuss sizing again if you are unsure
Best of luck ?