It wasn't hard, as I always did that on my Android devices anyways. I always ran a mix of some MSFT stuff, some Google stuff, and some OEM stuff I like.
For example, I still use my Outlook email as my primary, but I use Nine email app as MSFT's app screwed up Android Wear a while ago and I never went back. I use Gmail for my college email as the school had migrated to Google apps.
I use Sony Walkman app to play music no matter the phone I have. I use MSFT office apps since I have a 365 subscription through school.
I use Textra as my SMS app, even though it runs like garbage on Wear 2.0.
It's always been a smorgasbord for me...