Claire I don't know what you do as a home carer, but I would imagine that an AN position is pretty much the same. Basically you get patients up and give out breakfasts. Then depending on the type of ward. You assist them with their hygiene needs, bed bath, shower etc. You would make the beds. You would probably assist the nurses with things like routine observations, BP, pulse, temp, respirations etc. You might complete fluid balance charts or food diarys. Help give out lunches, and help any patients that require assistance with eating etc. You's probably help with moving and handling of patients and checking for pressure ulcers. I'm sure that there's a lot more that the ANs do, but of the top of my head, I can't think right now!
There's a lot of emphasis on legal stuff now, that is why I suggested that you might want to skim the Code of Professional Conduct. They also might ask questins about infection control, so you might want to familiarise yourself with that. Hope this helps. If you have any specific questions, I'll try and answer them