I agree with everyone's suggestions especially the book Quiltmaking by Hand by Jinny Beyer. That has helped me the most along with her Perfect Piecing tool. I use the tool for a lot of things other than hand piecing such as Y seems and partial seams done by machine. It helps you mark the 1/4 intersection on a variety of different angeled pieces.
I hope your friend enjoys hand work, I find it very rewarding and relaxing.