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This is a tough question to answer completely and can get a little technical but here goes. PDR is hard to learn because it involves seeing, interpreting, and doing things that you have never done before. In fact, many skills learned in dent repair are exactly opposite of everything you’ve probably ever done. The first difficulty is just finding your tool tip. Since you can’t see through the panel you must depend on “reading” a reflection that shines on the panel to tell you where the tip of your tool is. This is generally quite a difficult accomplishment for many students using standard training methods, and can take anywhere from a couple days to several weeks to master.