In A Pickle

First off ditch the Haynes manual . They give you just enough info to get yourself in trouble .
Luckily it’s not a blind hole if it’s the pressure plate to flywheel bolts . Is the trany/engine in the car ? You will need to make sure the drill doesn’t walk when drill the hole in the bolt and muck up the threads in flywheel . If you can take the pressure plate off you could take the thickest piece of metal you can find and drill a pilot hole in it then c-clamp/ vice grip etc it to the pressure plate centered on the bolt . Use a smaller drill and make sure the pilot hole is square/centered to the broken bolt . It may just come out while you are drilling ? If it’s a blind hole You could buy a left/ reverse bit so it back it out .