I can use any number of knives or scissors.
I just feel like cutting with a blade is sort of like, if you are anal and think you want it perfect. But, as Geoch said, you can take some slices out of the wood. And it is just sooooo much too much effort.
If I use scissors, it always comes out fine. It takes 1/3 the time with a scissor. And if you have cut enough rubbers with a scissor, you sort out how to negotiate the first part when the scissor has to dance under the handle. It isn't hard. You just have to figure it out. Once you figure out the little cuts you make to get past the handle, cutting with scissors takes very little time and is very accurate. Sharp scissors are good. But once you have done enough rubbers, you can do it with any decent scissors.
The first club I played at when I started again as an adult, one of my old friends was one of the guys who worked there. And I hung out with him while he put blades together for people. He had done so many. He cut so fast it was done before I realized. And it always came out perfect. Scissor just takes a little skill. Then it is by far the easiest way.