I agree with this prinnys quote , since you have had surgery if i got it right there might be a question about how you fixed your hair so nicely, what ever you do dont hesitate say mom,sister or a name of a friend instantly.
you can never hesitate when asked a question. hmmmm is not a good answer. they are going to ask you questions that may not have anything to do with the case like how do you do this and that after the surgery and these questons may violate your privacy. but in all time stay calm and answer polite on the questions if your lawyer dont object. look at it as you are going on a professional working meeting. what ever they throw at you answer politely and calm. best of luck my friend. if ya need to talk just try to get hold of me.