My daughter had a shunt placement in 2009 when she was 4 years old. I was worried about the shaven spot but it wasn't as bad as I expected. She had a 2x2 area shorn above her right ear. We got a bunch of fun hats for after the surgery. After the surgery she was out of bed by the next day and back to daycare by week 2 with no restrictions. After a few months of growing her hair out, she was able to cut the front of her hair so she had bangs to completely conceal the short spot.

Luckily for her, there haven't been any complications or headaches since then and she hardly knows it is there, except the spot where her tube crosses her collarbone... its tickle-y. I hope everything is going well for you and that your procedure goes smoothly.