privacy

As @unexposedhazard@discuss.tchncs.de already pointed out, there might be a misunderstanding of what MicroG "is". (Or maybe you are fully aware, but it is not clear to us...)

MicroG is NOT just an app you install & go. It is a deeply embedded part of your system you REPLACE the entire Google Service stack (GAPPS) with.

In theory, it is possible to "ungoogle" an existing system and then integrate MicroG, but it needs certain technical knowhow, like hacking around with adb, rooting, signature spoofing, ...

In other words. To setup MicroG "manually" is not necessary an easy task to make it work correctly. But if you want to tinker with it, by all means: go for it! But be prepared to encounter problems.

All technical info can be found on the site I linked you previously under the "installation" section: https://github.com/microg/GmsCore/wiki/Installation

However, a more convenient and much straight forward way to use MicroG would be to install a new Android System (i.e. "ROM") that already has GAPPS replaced with MicroG. Unexposedhazard already pointed out some systems. My recommendation would be "eOS" or "iode OS". Both of them come with a very user friendly configuration out of the box, so there is no need to tinker with it that much after installation.

Final note: Not all phones can be degoogled or flashed with another ROM. E.g. check the supported devices of the ROMs.

And what ever you do: Make backups of your data before fiddeling around with your ROM or any GAPPS. Things can break very fast. 😉

Have fun!