iFixit

Allowing the camera to auto-focus should be fine most of the time. However, in rare circumstances the camera focuses on the background instead of the object you're trying to capture. You can zoom in on the object or move the object away from the background.

Many cameras have a close-up or macro mode (often termed the 'flower' setting). Use this mode if your subject is less than 2 feet from the camera.

Shoot at the highest resolution possible so you have more flexibility when cropping the shot. We require you upload an image that is at least 800 x 600 pixels.

Set your ISO to the lowest possible number (ideally 50-200 ISO). The ISO setting adjusts the camera's sensitivity to light. The higher this setting, the grainier the photo will be.

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!