And yes, you may very well brake the housings trying to get the originals out of the dash. Usually just cracks though, so if they were still serviceable, it wouldn't be a deal-breaker.
But with the new ones finally available (and looking very snazzy when turned on I might add!) it's not as important to save the old ones.
But they sure are a tight fit in there! I've broken and saved a couple of sets over the years. Gotta squeeze pretty tight to clear the little tabs. I think there are two on top and two on the bottom, so it takes a goodly squeeze to get them past the dash.
Good luck.
Paul