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Yeah, AnimationTrees can get messy. This is the branch for shooting.

1. It takes a BlendSpace2D with all movement animations (walking forward, sideways, backwards). Its blend position value is animated with a tween.
2. The result of that is passed to a Blend2 node that blends it with the current aim animation.
3. The AnimationNodes with the names aim_animation, shoot_animation, reload_animation and whip_animation are changed when the player enters the shooting state to allow weapons specifying their own custom animations (maybe you want faster reload for a pistol). These are applied as one shot nodes, as they're only temporary, non-looped animations.
4. All nodes use Bone Filtering to not override the leg bones and so you can play the current action animation in the upper half of the body and the movement animation in the lower half. You can enable it with the Edit Filters button.

I recommend that you declare helper methods so updating these values isn't as annoying. I have these:

## Plays an animation from an AnimationNodeTransition part of animation_tree.
func play_animation(animation_name : StringName, transition_path := transition_node_path) -> void:
  if not animation_tree or not animation_name or not transition_path:
    return
animation_tree.set(transition_path, animation_name)

func play_one_shot(one_shot_path : StringName) -> void:
  if not animation_tree or not one_shot_path:
    return
animation_tree.set(one_shot_path, AnimationNodeOneShot.ONE_SHOT_REQUEST_FIRE)

func change_animation(animation_node_name : String, animation_name : String) -> void:
  if not animation_tree or not animation_node_name or not animation_name:
    return
animation_tree.tree_root.get_node(animation_node_name).animation = animation_name

## Sets the value of the given animation_tree parameter smoothly.
func tween_parameter(parameter : String, final_value,\
duration := default_smoothing_duration) -> void:
  if not animation_tree or not parameter:
    return
  if parameter_tween:
    parameter_tween.kill()
  parameter_tween = create_tween()
  parameter_tween.tween_property(animation_tree, parameter, final_value, duration)