If you screw up a cut? Wood is cheap enough, go out and buy another sheet.
Just remember, "Measure twice AND cut once."
You may also need to get a right angle square to ensure all your cuts are perpendicular to each other...
To help hide saw cuts you can get some aluminum "U" channel extrusions and just cap the ends of all your cuts that are exposed.
Power tools you should have to make it much easier would be a drill (prefer a variable speed, reversible with 3/8" minimum chuck) and circular hand saw.
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