I havent played the since like 4 months ago, so my memory is not really good but if your having troubles on night 1 and nights 2 and 3 (which you sholdnt) this is my idea to help you! Always check the right hallway for Tera and time for time check where is Gobo, but always have an eye on Tera because gobo shows you his/her eyes before atacking, and for Pico everytime you hear his mechanic sound of standing up spam him with flashlight
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also for some reason on night 3 tera and gobo exchange hallways, and another thing if tera or gobo is atacking always check the other hallway, there may be the other guy on there, and where your ready to detain picos atack first check the 2 hallways to see if there's someone ready to atack, if so close their door no matter if they're still not there, that way it's more easy to avoid a jumpscare while being with Pico