Character animations with the "whole body" visible in first person

As I see it I have to put together a whole bunch of third person animations and place a camera in first person.

I need info on howto link/melt animations together

  • leg/feet animations must be independent of arms and weapons.
  • Head must be independent of everything else when a button is pressed or TrackIR / VR is used.

How to put together something like this?