So I've sewn myself a skirt:
I still can hardly believe it, but actually it was quite easy with Anna's explanations and hints and photos:
As the fabric is thick flannel, it was a bit harder to gather the skirt and so my gathers are rather less then perfect but I don't mind.
I'm quite proud of the hidden zipper:
(not so proud of forgeting to match the pieces of the skirt back. I had a narrower piece of fabric and had to place the pattern pieces in a different way than indicated in the pattern, so I should have checked it)
Anyway, it enjoyed sewing the skirt and I've learned a lot and I want more.