I feel your pain. I'll bet your book and my double sided mirror eloped together.
A good alternative is a Tute here on the board. I think Eddie did it - but not sure. I'll go take a look in a sec.
Edited - here you go, and I was right, it was Eddie. Thanks again Eddie.
http://www.quiltingboard.com/t-35742-1.htm
I do know that I read the tute, walked right into my sewing room, and made a CW practice panel. Turned out great and was super simple. Pretty sure the tute also gave yardage approximations as well.