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I had the same question and if you search the threads you'll see the answers. In general..it's all been said...mask the area, start with a small diameter hole, work up to the size you need, drill slow...some one even recommend drilling backwords...it's more scary then anything but if you take your time it will cut through like "buttah" as Linda Richmond says (from SNL). I got a scrap piece of glass from Peter at ERA and practiced on that to get my confidence up. It is really simple and easy. I also took it a step further and reamed the hole with a reaming bit.
As for starting sizee you can go either by sight or the best is to use a micrometer to see you ending circumfrence then work down from there.
Hope this helps.
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