Getting floated

I'm a new nurse who works on a unit where the census is a rollercoaster and our pt counts often drop below the scheduled staffing, so the nurses get pulled to other units that are short staffed pretty much daily. I am just getting comfortable with the patient population on my own unit (post surgical) and I'm intimidated about getting sent to a unit with more acute patients, like cardiac or neuro. How will I be able to handle people on Cardizem drips or with chest pains when all I know is handing out pain meds and changing dressings? Being pulled isn't selective to what nurse is available (as in nobody's going to care how green I am), it's what unit has a need. I am trying not to psych myself out about getting pulled, but it's stressing me out . I have been told that I wouldn't be given an inappropriate assignment by some people, but I've also been told that the floated nurse gets the worst assignment . The nurses on my unit make getting pulled seem like such a bad thing, it's hard to not feel negatively about it before I've even done it. Last night a coworker who was pulled to cardiac was telling me how her pt was having pains and she had to draw a troponin level, talk to the doctor several times, etc. and I was thinking how over my head that seemed . I need a little pep talk or some advice about how to handle my first venture off my unit, which will be coming up soon.