You can modify your game experience quite a bit through the mutators menu. There's a bunch of mutators you can activate that makes the game easier, like modifying NPC:s speed and aim skill. Most of the mutators making the game easier are considered cheating though, so no achievements will be unlocked while using them.

You can find the mutators menu in game by holding both inventory button for a while, and then pressing the "mutators" button on the in game menu you just opened.

I already made it so the supervisors can't see me, but I can't seem to make the shield robots not see me as well and they are the ones causing trouble. Can't really find options to make the shield robots easier :-\

Kind of stuck at the firewall section, especially when there are no saves between phases, get shot once and it's back to the start of the entire thing.