I use microG on my main phone. I had to set them up myself, and I was told that I could just install them as any regular app through FDroid, but that was not entirely correct.
You can install them through FDroid, open the app, follow instructions, and both location services and notifications will work once all checkboxes in the "Self Test" page will be ticked.
Except that the "microG Services Framework installed" checkbox will never tick no matter what you do. Everything will still work no problem, except that microG will not be able to run privileged actions, in particular it won't be able to immediately awake sleeping apps when they receive a push notification. This will cause delays with instant messaging apps and other time-sensitive notifications.
I solved all of this by installing through this unofficial installer. The downside is that this will also install some (FOSS) bloatware which you can't uninstall. But you can disable all the stuff you don't need, and you will also need to disable it from auto-updating from FDroid otherwise it will re-enable automatically.
You might also be able to find a ROM with microG already installed. If it exists perhaps I would recommend doing that instead.
You might still have some issues with integrity checks unless you install other mods. This might cause issues with some banking apps. You won't find any official guides to bypass these checks though, as this is a gray area.