First I removed the single screw holding the lens assembly in place. Then I lowered the assembly and tilted it until it came out. To remove the existing cracked glass lens there were four tabs bent down on it. By hand I lifted each tab just enough to remove the broken lens. I then replaced the broken lens with the new one and re-bent the tabs down by hand to secure them to the new lens.
The lens assembly, now removed, revealed the cavity that contained the two halogen bulbs. Since they were both burned out for days, they weren't hot so I could pull each one out by hand. The bulbs are secured by two straight heavy gauge wire leads and provided a little resistance but come out fairly easily. Make a mental note of the angle they came out so it will be easier to replace them with new ones.
You're not supposed to touch halogen bulbs with your bare hands, so I used the bubble wrap they came in as a means to hold the bulb while installing it.
Be sure to insert the bulbs at the same angle they came out so the pins do not get bent.
Once both bulbs are in place, replace the lens cover assembly by putting the end opposite where the screw hole goes in first on the right, then swing it up until flush and screw it down.
Turned of f the circuit breaker to the microwave. Unscrewed the cover (1 screw!) popped out the old bulbs and plugged in the new ones, using the bubblewrap as a handle to be sure my skin didn't touch the light bulbs so the oil from my hands didn't damage or shorten the life of the new bulbs. Turned the circuit back on. That's it!
