The biggest difference between you and almost all of your patients? You have keys.
Don't crowd anyone's personal space.
Take violence precautions seriously even if your patient appears to be gentle...especially if your patient is actively hallucinating.
Don't be scared; just be careful.
Psychotic people are SCARED about what they are experiencing; as long as you keep that in mind they are not scary.
Understand that what your patient is thinking/feeling/hallucinating tends to be as real to them as your hand is to you.
Even when a patient's delusions are hilarious (happens occasionally), keep a straight face and DON'T laugh about it at the nurses' station because at some point the patient may figure it out...and will be very hurt if so.