On 19 May, 11:02, Mark wrote:

You need a /very/ sharp blade for this, otherwise it will tear. It's
best if the paper is not too wet.

You don't need an especially sharp blade, so much as a smooth _non-
sticky_ blade. One with a worn or chipped edge is obviously bad, but
so is one that has been used for cutting roof felt or such and has
"goop" stuck to the sides of it. Wet wallpaper cuts easily enough. So
long as the blade can then slide smoothly through it without sticking,
this "cut & butt" approach isn't all that hard.