Once I received the replacement part the repairs were really simple. Since I had to remove the broken grill vent to replace it, while I had it off I simply removed the old charcoal filter and slipped in the new charcoal filter into place, than installed the new grill vent, reusing the 2 screws and screw clips from the broken grill vent and screwing it securely into place.. The old grease filter is accessible from the bottom of the microwave hood combination that I have. To replace it, you just slip the old filter out and slip the new filter into place. To replace the exterior light bulb, you have to open the glass panel, by removing one screw to get to the light bulb. After removing the burned out bulb, replacing it with the new bulb, you just replace the glass panel, screwing it securely back into place. The only tool I needed, had been a screw driver.
AppliancePartPros.com also have a how to video, with every part, showing how to replace that part, which is very helpful for folks who are not do it your selfers.