Most of the time when talking about mains you count from the center out. Same thing with grommets. More often than not H and T are designations for the He'd and throat of the racket so if you skip 7 & 9 the first 6 mains goi in grommet holes 1-6 and the 7th main going in grommet hole 8 and the 8th main goes in grommet hole 10.
One piece means no hybrids as hybrids are two different strings.
I have the ability to drive people crazy, not sure if I was born with it or I learned it but I'm damn good at it.