EASY...
open your little storage thingy (useless thing that opens under the HVAC controls) Then pull that storage thing up (be firm but steady) it should then be able to be taken out and you can put it aside. You will then see near the center top behind where the storage thing was a screw. Unscrew that screw. then greab the HVAC controls from the bottom, and pull them out. The panel should pop out. Again be firm but steady and gentle. Unplug the wire connector holding it in, then you can look at the back of the controls. The white (maybe light grey) small circles (centimeter or so diameter) are the bulbs, you can take out whichever one you want with a small flathead screwdriver. Pop in your new bulb, and do all the steps backwards.
Should take you no more than 10 minutes max.
I know these instructions sound long and confusing, but just check it out and you will see what to do, and it is all easy.