I gathered enough wool, but then I had no space to knit! Now I've cleared some space I thought that I would have my first attempt. Being that I hadn't tried it before I wasn't sure how many stitches I would need, or how it would turn out, I picked a bunch of 12 reels and cast on 15 stitches and I knitted.
It worked out that 15 stitches was a good width for a placemat so I kept knitting until I had a good length and then I cast off. Now I have a lovely new placemat for my dining table.
I'm going to do a much larger version with some more strands as a rug for the lounge, I just have to choose the colours. Maybe I should make myself some dinner first though!