I ran into a similar situation, my husband's grandmother passed and I was given pieces to a quilt she was working on as well as the pieces she cut out, but nothing else. It was the first quilt I finished. I made it for my father-in-law. I just jumped it with both feet and it turned out fine, however, what I was given wasn't as complex as yours. If I received what you did, I would either try and set up the blocks and see if I notice some sort of pattern. If you post a few pics, some of the more knowledgable quilters might now the blocks and what to do with them. If you are still nervous, I would make a couple quilts and then try the one you were given.