I’m running it on an OpenWrt One and loving it. Not the best perf-per-dollar hardware but it does what I need at the moment, is completely open, and supports the project.
There’s a learning curve for sure. You might consider buying the cheapest possible router that supports it and experimenting with that on the side before overhauling your main network. $30-40 (or cheaper used) for the peace of mind of knowing you aren’t completely up the creek if something goes wrong.
Oh yeah, seconding the recommendation for GL.iNet routers with OpenWrt (technically their slightly modified fork but it’s very close to stock) preinstalled as an easy way to get your feet wet. They’re pretty nifty little travel routers, good to have if you don’t already make a habit of putting something between your gadgets and hotel wifi.