I always make a practice block before I buy fabric for a magazine pattern as I had pattern that had a very bad mistake once. I had never had a problem with one before so I cut everything at once. It was a cat centered in a block and when I started to put it together the cat was so much longer than the block it hung over each side about an inch. I was lucky to be able to find the same fabric and cut it larger and saved the quilt. Lesson learned the hard way, there are sometimes mistakes in magazine patterns.