Buy the Bearded Ax (or other throwable weapon) and smoke bombs, find a group of guards standing and stay close to them so go to the map and mark your position move away from them until 10 or + appears, then target the guard with L1 and press Square to throw a smoke bomb, switch to the ax and press Square to throw it, then find a guard with a spear and take his spear, run away from him and do the distance mark procedure aim at the guard and press Square to throw the spear
you can see this video on youtube=
as an example of what I said in the tip above!! I hope it helps!!