Kids are so adapting. My cousin has a 3 year old and just refers to my scars as my boo-boo. (she now says she can't see my boo boo anymore - they have faded and are still visible - but she can't really tell). She came when I was in the hospital and wasn't afraid and I had crusted blood on my neck and tubes going in me in all different ways. She was more concerned with putting lotion on her hands and mine. I'd just refer to your changes as "daddy's boo boo" and she'll never be the wiser. As for what changes you will actually go through and what you can do to prepare yourself - I'll leave that to those who have had the treatment as I do not know. best of luck to you.