This difficulty is more similar to Very Easy than Normal.
Guards do not fall asleep after one M9 shot, but they will fall asleep fairly quickly after 2 shots.
Hind-D, Wolf 1, Wolf 2, MG-REX take the less damage to kill
Pick up the M9 in the lockers at the Docks.
Must deplete M9 ammo to generate a magazine for the Dock Prozac Skip
When approaching the Vent guard, fire an M9 shot very early, and fire when he spots you.
You do not need the chaff for Nuke Bldg 1F door skip, so hold up and then tap upright after 3 steps forward at the Canyon.
You can equip the M9 in Nuke Bldg 1F, so use that for door skip.
Fire the M9 in FPV when you get to the second grate by the missiles. Fire the M9 in FPV when you climb the middle of the 2nd staircase.
When alerting Meryl to your presence in Nuke Bldg B1, fire the SOCOM in the hallway before entering the office area. Then hold downleft to get into Meryl's sight.
Go upleft at the rock at the canyon, take a similar line to Normal.
Go to the right from your starting position to fight Raven, so you flank him.