I took my time and spent a little less than an hour on it. This included getting it cleaned back up and painted out, ready for reassembly. I could probably do it in half an hour pretty easy now that I know what the end result should look like. Take your time and you will only have to do it once.
I used a combination of a fine grinding stone and a cut off wheel. The cut off wheel gave me a flatter surface than the grinding wheel did. The flatter surface was more of an aesthetics thing than function.
As far as glocks go, I find them to be crude in the way they feel and all the hype is just plain annoying. There are lots of fine pistols out there that I personally find more comfortable to shoot. Yes they are reliable just not buying the whole "you have to get used to them" concept. For me if it is not natural, keep looking. In a panic situation you are going to do what comes naturally not what you have learned at the range, unless you have spent countless hours forcing it to be a form of natural. For some I realize they are a good fit and they are the ones who should be shooting them. They are just not a one size fits all like most would have you believe.
anyway that should ruffle a few feathers. People don't realize I am not anti glock just don't believe they are do all - end all kind of pistol.