As a fellow Godot user who learned how to work with 3D characters during this jam, I strongly suggest you do your character animations in Blender (which is a more suitable tool for this task) and then import them for use into Godot. You'll save a lot of time!
Oh that is what I did for keyframing animations for individual actions. Beyond that was the tools for blending animations, animation states, and trees which I was learning how to use fully. Plus I had all these animation ideas for car crashes, running pedestrians that I start to become overwhelmed by and realize how much coordination would need to happen to synchronize them while not taking away player agency, which was a design question I should have considered sooner.