I was given a beautiful Erhman tapestry kit which has taken months to do but I have finally finished it. I did it in tent stitch and as expected, even though I used a frame, it has distorted and is rather a rhombus shape, not square.
I've read and watched quite a few YouTube videos on how to wet, stretch and nail the canvas to bring it back to a square ready for making into a cushion.
I'm patient, accurate and have very high standards so feel as if I could do this, but is it a difficult thing to do? The videos make it look quite straightforward which can be worrying, especially when it seems that people often send them away to be finished.