You might want to consider getting an Accuquilt GO! It is supposed to be much easier to cut fabric this way, and it cuts up to 4 layers at a time. Pricey, but I think worth it in the long run to be able to cut fabric to desired shapes at home. Here is the website:
http://www.accuquilt.com
Aside from the demo on the website, there are some helpful demos of the GO! on YouTube.