The only way to cut fabric is with a rotary cutter. Never used one? Well this one is the best on the market. With an easy to use handle, the grip exposes the blade when you need it, and covers it up safe and sound when you don't. 

Safety is a priority because these blades are Sharp!!!

45mm is usefull for all but the tiniest of curves, and it works with pinking blades too.

OLFA 45mm Rotary Cutter