I use a ten blade from breastbone to lip and by stretching the lips am able to get a really clean lip line. Use caution along the lip to avoid cutting the fleshy part. The point at which to begin clipping varies slightly from dog to dog, but dogs with good conformation can pretty much start at the breastbone.

Using a 9 or a 7f depending on the dogs coat I set a line going into the shoulder from the neck, blending well with thinners to avoid leaving a line where I want the back to blend into the shoulder. You want to SEE shoulder and it is easier to accentuate this area if again you use a "V" shape to show where the angle is on the dog. If the dog has good bone structure you can set the lines based on the dogs body.

If the angulation is not correct the lines should be placed to give the illusion of the correct line.

neck view

The neck is clippered in reverse

 from breastbone to lip using a ten blade making sure you remove all the hair from the creases and the flews along the lips. There is a "v" shape again over each shoulder and a "v" in t he front of the neck at the breastbone.