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.
Everyone has the right to be stupid... it's just that some people abuse the privilege