All you need to do is pull the cluster out away from dash and remove the bell shaped metal housings that have the bulb in them, pretty easy!
also i found that on some of my new ones they would not stay in place even after trying to pull the tabs out on them to make them a little more stiff, so what i ended up doing
was installing the housing in place and using a small dab of hot melt glue and that kept them in place, and if you need to replace the bulb you can just scrape away the clear glue and replace.
FWIW
Allen