Editing Existing Animations in Blender
Need to know
- How working in Blender and creating animations
 - Skeleton animations (*.skl, *.skls, *.omf)
 - Camera animations (*.anm)
 
Editing hud animations
- Import a hand hud model
 - Import a model of a weapon or something else
 - Import the hand and object animations you want to edit
- (Optional) Attach the main hud object bone to the hands 
lead_gunbone (Using Copy Transform Modifier) 
 - (Optional) Attach the main hud object bone to the hands 
 - Edit