I want to rewind the game a couple of steps but I only have a quicksave and autosave, no previous saves. I'm in the bunker field near the Black Mountain and I want to go back to before I met the Ranger - ie before he takes off the exploding collar and we get attacked by the Brotherhood of Steel.

Is it possible to edit my gamesave so that I can reinstate the four BoS attackers, the Ranger, the first BoS soldier in the BoS bunker (on the left as you go in) and go back to being tolerated by the BoS ?