Most of my devices I was able to flash it right to it (or TFTP boot the installer and go through the steps via console cable). On x86, you just flash a boot image with dd.
The hardest "install" was to a batch of enterprise APs where I had to attach a programming clip to its flash chip and use a Rapberry Pi to burn the image. After that, though, I could update them normally
If you've reached this point in your OpenWRT install, turn around. lol. I only kept going because I thought I was bidding $12 on a single Aruba AP-105 and ended up getting a lot of 20 (for $12), so I had to figure out some use for them.
Usage is pretty straightforward through the web UI (LuCI). For some more complex configs, it's sometimes challenging to figure out the UCI syntax to configure (when I was playing around with B.A.T.M.A.N for example) but otherwise is pretty nice.