If on PC, yes.
If on Android, as long as you move your saves over before deleting your old game file, yes.
As always, the only way to screw it up is to not follow the instructions.
Save file location depends on your device of course. For example, on PC it's:
C:\Users\<User>\AppData\Roaming\RenPy\Harem Hotel
On Android I've heard at least two different locations, so you might wanna use your file manager and search for Harem Hotel.
Relax my dude, you don't need to start over simply because you haven't located your saves.