I'm not an expert at covering by any means, but I use a Higley covering trimmer <http://www.srbatteries.com/hrdtools.htm>. It has worked well for me. I used to try to use just an Xacto knife and that worked terribly. I'm sure this tool is available at other than SR Batteries, its just the first hit I got when I searched for it to post a link to a picture.
I use one as well. It takes some practice, and an extra set of hands or clamps to secure the panel while trimming will guarantee a clean seam. A box of single edge razor blades powers one of these trimmers seemingly forever. I've covered wood and even foamies using one.
FWIW, the Harry Higley & Sons page is: http://members.aol.com/harryhig/Tools1.htm Many hobby shops and distibutors carry their products.
-- Andrew E. Mileski
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