It is unavoidable that when you start out you will seem like RoboNurse reading from a textbook. Guidelines and theory are a bit like armour - they help us feel safe when we jump into dangerous, unknown territory. And working in psyche, you really don't know what someone will say to you......."my life is worthless", "I'm married to Shania Twain", "they want to kill me because I know who killed Princess Diana", "I want sex with you", "that's not medication, it's poison", "my thoughts are all over the internet", "my father had sex with me for 12 years", "if I touch the door handle I'll be contaminated", "when can I go home?" "what do you think of my diagnosis?" "nurse Smith doesn't like me", "I've cut myself", "My husband beats me up and brings prostitutes home", "alcohol is legal, what's wrong with heroin?", "do you have children?"
Please don't think you have to get things 100% right 100% of the time. As a newbie, your experienced colleagues should not be expecting any polished displays of professional expertise from you. It is inevitable that you will get things wrong, probably quite often. But, unless you are being deliberately malicious, you will do your patients no harm. Don't feel offended (or incompetent) if experienced nurses tell you where you went wrong or how could have done better: you're new at this and it's not an easy job. Kudos to you for jumping into the water with us - most people just run away.
Therapeutic communication skills don't come naturally to anyone. With experience, and lots of reflection, (both of which take time) some nurses make it look easy, sometimes they can make it look like fun. But they still get it wrong sometimes.
Welcome to the wonderful world of psyche. Don't give up. You'll have a dark patch where you'll think something like: "Maybe I should sell burgers instead". But keep going: we need people who care.