I've had three fat harvests (unfortunately, my waist is no slimmer!) It seems like you really want to know what to expect, so not knowing what approach your doctor will take I'll share my experiences.
My first fat graft was taken fairly high up ("muffin top" region) on the right. It was closed with stitches at first, replaced by steri-strips after a few days. The other two (different surgeon than the first) are lower on the left as others have said and had no stitches. The last one was used to plug a spinal fluid leak, so I guess they really tried to take a lot of fat (I actually do have a little depression under that incision now.) I had a drain in that incision for several days and my entire abdomen was VERY bruised and swollen like a grapefruit. More than four months post-op, it's still a little bit bruised looking. Actually, as bad as it looked, it didn't really hurt much. I think that extreme result with the last incision was because they were taking a lot of fat for the CSF leak, and it was less than a week after the translab so I had a still fresh incision just above it.
Mostly, this is a really minor thing in comparison to the rest of the surgery.