2) No torques head screwdriver is included but it says one's included in the instruction sheet. I supposed you don't need one, and you can bend the heck out of the circuit board (someone is going to break their iPod this way and you can easily damage the thin wires on the battery).
3) The instruction sheet is printed with too large a dot screen, it's pretty useless for the detail photos.
4) The two tools to open the iPod work, and it doesn't take too much effort to get it open, but the instructions could include 1 more line in there that would solve a lot of problems for many. The actual tool doesn't go straight in, it needs to point down.
Pulling out the old battery isn't that easy. Unplugging it can be hard, you'll have to work at it, and I can see someone breaking something from tugging too hard. Underneath the battery are some weird little mini circuit boards. Although I know they can be smaller, this is pretty small.