Ok now that we got the other basics down, let's now add realism. First, the switching. Just tell your weapon to turn forward, and move backward and the pistol to move forward and up. (I'll post a thread explaining why these directions). To add breathing, create an event that says While the world is running, arms move up, then down, but use a small amount of movement. Next, walking movement. Just create an event that says While a key is pressed, then in begin, place a do together that says
Do Together
(arms) move .2 meters to (the direction chosen, left arrow, right arrow, forward, backward)
Then, in during, place,
Do Together
Camera move (direction) 5 meters duration 0.25 seconds abruptly
Do in order
(arms) move up 0.1 meters 0.05 seconds
(arms) move down 0.1 meters 0.05 seconds
Then, in end, place
(arms) move (opposite direction) 0.2 seconds
That's how you make realistic movement.
Part 2 /other discussion. If this doesn't work just tell me. I'll give an update directions.