As posted above it is not a big deal.
Took me abut 10 min including taking the time to explain to a fellow RV'r what I was doing and why.
He was kind of surprised at how easy the old ones came out and the new ones went in.
The tool and old set are now bagged up and ready for the mail in the morning.
On a side note.
I have lived here for just over 20 years now, the people that lived here before had a older TT.
Well while I was changing the locks I kicked up an old key.
Ya it is an old CH751 after cleaning it off it worked on my outside shower door....