I had a difficult time rotary cutting accurately, and happened on the book Rotary Magic by Nancy Johnson-Srebro. It's available on several websites, including Barnes & Noble and Amazon (less expensive on Amazon.) It covers the basics of cutting, piecing, pressing and finishing plus has 12 projects - all written in an easily understandable and cute way. I have the Fons & Porter book, but it was too much information for me as a beginner (its definitely one for the library, tho!)