Sorry to hear about your scar, I'm actually thinking about doing the same thing. My scar is small, so a tattoo would be very easy to cover it up. I've got 2 tattoos, they didn't hurt at all, I've also got a piercing, which also didn't hurt.

If you're up for a Koi, I bet it would look really nice. I would like to see it as well.

One major thing you have to account for is money. The bigger and more detail a piece is, the more it'll cost. Also you'll have to live with it for the rest of your life.

I say go for it, I love beautiful art on beautiful women.