Oh my!! That (tight) bass!
To anyone considering this, do it! As above the boomy bass on mine has tightened up significantly, and the highs are more defined too. Well worth it.
I just used the first pair I saw in the office to be fair, your standard, run-of-the-mill scissors. It helped a bit to press the pad on the desk and compress the sponge to make some initial cuts but it wasn't too hard at all.