Finally, on to the guitar string instructions: Unwind the guitar key.

It's important to have your hand in the shot in order to convey the action being performed.

This can be difficult. It's easy to get your arm in the shot, or have your hand obstruct what you're trying to show.

Fill the frame with the part of the subject pertinent to the step you're describing. When in doubt, go closer - but don't use digital zoom.

A lone person can often take all the pictures with a fair amount of dexterity and the help of a tripod. Of course, practice makes perfect!

Most cameras have a short (2-10 second) timer option that can free your hands for a shot. This will also eliminate camera shake from pressing the shutter button.