It appears that our new Eyelet Pliers don't come with instructions, so here's a quick tutorial to show you JUST HOW EASY it is to set eyelets with them.
1. Mark the spot where you want to place the eyelet.
2. Punch or cut a small hole in the centre of the marking.
Tip 2: It's better to err on the side of the hole being too small, rather than too big. You don't want a wobbly eyelet that's going to fall out within a week or two!!! A 4mm hole will do the trick for a 6mm holed eyelet.
3. Push an eyelet through from the right side of fabric.
4. Place a washer over the back of the back of the fabric (where the cylindrical end of the eyelet is poking through). Make sure that the RAISED curve of the washer is facing up, and press it down over the fabric so that you can clearly see the end of the eyelet poking through the washer.
5. Line up the pliers with the flat side of the pliers on the FRONT of the eyelet (on the right side of fabric) and the side with the LUMP in the middle goes to the BACK (washer) side, as shown in the pic below. I know this LOOKS wrong, but it's not. Double-check that the eyelet and washer are still aligned and.....
6. SQUEEZE! Check that the centre of the eyelet has rolled sufficiently over the the washer to make the eyelet secure. 
TIP 3: Eyelets prefer a bit of thickness in the fabric. The thinner your fabric the more the eyelet will crack as it rolls over the washer. The more it rolls and cracks the rougher the back of the eyelet will be. This isn't necessarily a problem - just something to be aware of if the back of eyelets are placed where they could rub on skin or delicate fabric. 
Left: This is the back of the eyelet on a strap with interfacing in it
Right: This is the back of an eyelet in a thin fabric strap (same fabric but no interfacing)
And this is the FRONT of the eyelet.... swish, huh?
I don't know about you, but I LOVE a bit of metal on a bag....