What and how do you use various landmarks for trimming and shoeing a horse?

One of the best instructions I've found was a 1917 US Army Horseshoers Guide. It explained proper method for paring the sole: use the knife only to pare enough sole to expose the white line. Forget about yielding to thumb pressure, if you can achieve that, you've gone too far! A letter from a Cavalry soldier to Lincoln during the Civil War complained of government blacksmiths paring hooves too thin, so that if a horse lost a shoe on the march, he would be too lame to make it home. Soldiers were ordered to kill such horses!

Could anyone post a video that shows how much bars should be trimmed and what factors are kept in mind while doing this?
—Dr. Naveen Kumar

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