Realtime Control Rig in Unreal
Here's a very quick tutorial on how to have your control rig do realtime animation overrides, such as touching things, pushing buttons, putting your feet on the ground properly, looking at things, and head motion.
I couldn't find any tutorials on this, but hopefully there's lots and I just have terrible googlefu. But here's the basic idea: there's a Control Rig node in the animation graph.