Hi Prodical,
If the bushes need drilling out do it a little at a time, Ie: 9mm drill then 9.5 then a 10mm and so on and keep pouring water on the bush as you drill to act as a coolant, most suspension bushes are rubber mounted and it it get hot and starts to spin around you have pretty much Shag-ed it.
Not try to teach Granny and all that, but would be a shame if it was ruined because it got to hot.