iFixit

Near the other top corner, insert an iPod opening tool into the seam between the front and back of the iPod

On the other side, insert an iPod opening tool into the seam between the front and back of the iPod.

You may find it easier to angle the iPod opening tool stuck in the top corner in order to create a sufficient gap.

Remove the iPod opening tool from the top corner and insert it into the seam between the front and back of the iPod, leaving at least 1.5 inches of space between the two tools (as done on the other side).

At an angle, carefully insert a putty knife about 1/8 inch into the seam between the two opening tools.

Again, there are thin metal rails running along the inside of the rear panel, so take great care when inserting the putty knife.

Once the putty knife has cleared the lip of the rear panel, angle the putty knife so that it is vertical, and carefully (but firmly) wiggle it straight down into the iPod via the gap between the iPod opening tools.

Push with your fingers on the rear panel behind the putty knife to minimize bending. Ever so slightly flex the putty knife to ensure that most of the metal tabs on this side of the iPod are disengaged.

The metal clips near the corners are notorious for tenaciously gripping the front panel. It is necessary to disengage these clips in order to open the iPod.

Carefully insert a metal spudger into the area near the stubborn metal clip.

Gently wiggle the metal spudger down so that it is all the way in the rear panel.

Gently begin to disengage the clip from the front panel.

It is easy to create a noticeable bump in the rear panel here that is difficult to repair. When prying the tab free, try to have the metal spudger pivot on the edge of the rear panel rather than bending the rear panel outward.

Continue to push up on the front panel with the metal spudger until the metal clip releases.