pmui - What size bulk head are you using?
I drilled 2 of my 3 holes this past weekend. I could not tell you how scared I was drilling the first hole. Once I started it was super easy. I had 2 holes done in less than 30 minutes with lots of "stop and take a look" time.
I will be getting the hole saw for the 3rd hole this week!!
Major thanks to JustOneMoreTank for posting this and giving me the blind confidense I needed, so that that I too could do this.