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Dave, I asked the Home Depot guy to cut the 4' X 8' panel in half (4' X 4') so I could fit the thing in my car. Before surgery, I donned a face mask, safety glases, an old G.I. fatigue cap and work gloves. [As John mentioned, a good "utility knife" or carpet knife will keep the "dust" to a minimum.] Throwing all caution to the winds I set the Homosote on the picnic table (outside), and used my power Jigsaw (dry wall blade) set at a 45 degree angle and "ripped-away." On curved sections, I chalked a template on the material (black side up) and used the same cutting method. To save material on curves, it is a good idea to plan ahead. Grab your old "plane geometry" book out of the closet and scribe your curve sections out with chalk before cutting. You may have four [or more] "arcs" to a long curve. Be sure that the ends of each "arc" match each other for a tight joint. This is fine for a continuous radius that is constant. For variations in radii, I used newspaper [cut as per a pattern] over the plywood. Perfect? No, some filing was needed but I took the precaution of making my cuts "full" (1/4" both edges) over the pattern. If you are under the radius, its a "bad day at Dry Gulch!" I'm sure other Contributers may have a better (easier) method than this Neanderthal approach. The only engineering skills I have are at the throttle. Best of luck Dave and enjoy.
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