Matrix is likely the most complicated thing I've ever set up to host myself. Setting up the bridging was a bit of a nightmare as their development moves at lightning speed and docs were light.

Guides were available, they just didn't always explain all possible config options.

If you do set it up, don't go down the rabbithole of trying to sync old message from other platforms to matrix, the current matrix standards just aren't set up for it, and the basic experimental implementations that synapse has for it are buggy as hell.

Just be happy with future message getting bridged. Once you're a few months in, you'll miss the ability to go back in time less and less.