Changing oven light. I've tried to figure out how to change the light inside the microwave (not

Question

I've tried to figure out how to change the light inside the microwave (not over the stove), by looking at the diagram on the sears.com webpage. The part I bought was WB08X10050, halogen lamp. Near as I can tell, I have to remove the top of the microwave to dig into the area where the lightbulb resides. If so, who designed this so that a lightbulb couldn't easily be changed?