i am usually quite good at interviews, I have always been offered the job! I usually look very closely at the job spec and try and jimmy into the answers evidence that I am the kind of person they are asking for.
I dont know what a homes administrator is, but a general question I have been asked before are something like why would you be a good person to have on our team, can you give an example of how you have worked with other organisations/ other professionals....it is also helpful to add to your answers about where you have achieved stuff in a previous job, again thinking about the person spec, so you are providing evidence that you are the kind of person they want to have. It also doesnt matter if you dont quite understand what they are asking, I have asked before for clarification of a question, or asked them to repeat the question.
Just remember that you can do the job and the people doing the interview want to give the job to someone, so it may as well be you.
Not that long ago I didnt put myself up for a job because I thought there would be someone more qualified or better at it! the bosses then employed people that certainly couldnt do the job better than me and had less experience. I didnt forget that lesson and when anthor job came up I went for it and got it
You go get em girl, basically tell them what they want to hear and more and make them believe that you are the one