I still suck badly at Alien Isolation. But I am making a bit more progress. One lesson I have learned is that my natural inclination to get as far away from the alien as possible just doesn't work. The creature, it seems is attached to the player by an invisible rubber band. If you do try and sneak away to the far side of the map the Alien will pop out of a nearby vent and surprise you. The safest place in the game bizarre though it seems is to creep around behind the alien. If you can see the creature then it cannot surprise you.
I am also convinced that the conveniently placed lockers and boxes that appear all over the game with big "hide here" pop ups are death traps. In the first instance the make an almighty racket getting in and out. They also restrict your vision and restrict the motion tracker. The alien can and will attack you in there and you have no escape route.
If you must hide then sneaking under a take is a much better bet especially one you can exit from both sides. Even a dark corner can be safer than a death trap locker.