Yes, once you squeeze the spring you fish out the pair of keepers and remove the spring. Keepers use the force of the spring to wedge them into the notch on the end of the valve stem. A magnet is handy getting them out. Then its out with the old and in with the new seals. The old ones may resist departure, just be careful not to dent anything around them. especially the smooth valve stem shaft.
I changed mine tying to get the oil usage down but it didn't change anything. I upped the oil vilcosity to the max 20w40 and its to a tolerable qt/1200 miles, almost doubling it. It annoyes me that I had a Peugeot diesel with 266,000 miles on it that leaked half that.