Good advice about the edge tape. I sometimes use a thick tape on the blade before cutting. After cutting, remove the tape and the rubber will have a very small and neat overhang
That is awesome advice, Tnykin.
That is the way to go.
@ Shiro: my guess is that edge tape would be enough to help protect if you messed up a little cutting. Another thing to think about, if there is a chip at the edge, that is not where you hit. A lot of the time, by the time you change rubbers, there are chips at the edge of a rubber. Most rubbers do that as you play, but especially with Xiom rubbers, many of them will chip and tear near the edge. It does not really matter.
Another thing to think about, as you cut more and more rubbers you get better at it. There are a few people who have me cut their rubbers for them so I have had a little practice. I am much better at it now then I was 4 years ago when I did my first. I used to use an Xacto Knife to cut my rubbers. Now I just use sharp scissors. I like the scissors better. I can cut the rubber in half the time and I feel like I get just as good a cut. But whatever you use to cut the rubbers, as you practice you get better.
And the edge of the blade is not as important as the center. After you use those rubbers for a few months, no matter how perfectly they were cut at the beginning, they will have some dings and tears in them, regardless of what kind of rubber you are using. As long as you play a lot and hard, what I just said is simply the case and nothing to worry about. Nothing wrong with having a racket with battle scars.