Help Needed w/Longies

I pretty good w/EZ, but I'm stumped on the hip increases on the longies. If any of you have time to explain, I'd be so grateful.

First, she says center-back & center-front, but center-back is in the middle of the short row? So does she really mean this, or do the hip increases actually go on either side of the short rows?

Second, she's asking for 30 rows of increases--is that right? It seems like a lot.

Thanks in advance--I'm cloth diapering & have fallen in love with wool--