For small seams I use a very old (at least 35 years) ripper that I cannot remember the name of, but it is the greatest. for longer seams I use my 45mm olfa rotary cutter. I've watched Eleanor Burns (Quilt in a Day) a number of times doing it and I've learned how quickly it can be done. You just have to be careful and not try to go too fast. I've been thinking maybe a smaller blade would be easier, but you may not get the leverage needed from the smaller handle. I've also used the eyebrow trimmer, or rather, I should say, tried without succcess to use it, just couldn't get the right angle.