I've just dived in headfirst.
I'm not trying to completely de-google my phone usage, but I have felt a little too tied to, and reliant on gmail, contacts calendars etc.
A good first step would be the ability to sync contacts to a local database of contacts shared between my phone and computers on the local home network. However, I'm not sure what to use.
I've seen references to CardDAV and CalDAV. I'd like anything that I use to be widely used/supported.
I also use KDE apps quite a bit, used for sharing files through a network, but never really had much use for the Kontacts and Kmail apps. Perhaps they would be a good avenue because I use KDE on all my linux computers.
I currently have a clean install of GOS, I've kept google play/services and google services framework off the owner profile. I'd prefer not to have to switch profiles to use emails and get notifications etc, but separate profiles may be a good idea for banking.
Anyways, shoot me ideas.