Hiya,
I don't know if this will help, but my boyfriend was born with an extra finger on his right hand (25 years ago!) and his parents had it removed, however his fingers were also 'webbed' together so he had 2 trips to surgery in the end. However his hand functions just like his other hand. One of his fingers are slightly bent and his other hand is stronger but it has never been an issue with him. He's a chef so he uses his hands alot and never complains of pain/discomfort etc. The doctors/nurses will give you lots of advice aswell so don't be afraid to ask questions if you are still concerned, but I'm sure everything will be fine.
I hope this helps xxx