I too enjoy interviews and only 5 times haven't got the job I applied for 2 I got offered another job, 1 I didn't want, 1 I wanted and didn't get but assume they had a difficult job selecting because they rang told me I was 2nd choice could I wait until they had, had a response from the lady selected, "of course" says I whilst thinking like F! I will! if I get a better offer, she took the post...darn! I would have loved that job! and one I didn't actually understand what the job was :) 1st lesson learned never made again, research the company and job.
job interviews are a 2 way street, I have turned down jobs that interested me because and interviewer was an arse and I thought if you are that much of an arse at interview then I don't want to work for you, flip side is I wasn't that interested in the job I currently do, but by the end I so like the interviewers and they made the job sound amazing I wanted it and I wasn't disappointed.
this one is important, if there is any risk at all the person you are replacing is going to be interviewing or even if they are not, someone on the panel might have appointed them, so if they ask you what changes you would make, start with the pre-fix, obviously I don't know every day to day aspect of the role and I would imagine there are very robust procedures in place already so I would give the role a few month whilst I settle in to see how I feel they could be improved or should be left but some key areas I would be looking at in relation to this role are.... and how if XYZ not already in place I would...
caveat on this is that the first proper job I ever had after college and researching I realised the entire finance department had been sacked for embezzlement! So I had to act like this was a new department and I had NO idea about the Bad history! no point rubbing their noses in it :) (Before my life in Occ Health and Nursing I worked in finance)
I am a chatterbox and love talking about myself and achievements, so whilst this helps at interview, I have to reign it in, and can.
no shame in asking for the question to be repeated and this tip is my top one I use it even when I have understood the question but can't think what the chuff to say, gives me breathing time and never ever leap into an answer until you have run the question through your mind once, people won't even notice the gap, even if you think it takes you an age I once got show a film of my interview and I couldn't even see it.
last is if you don't get the job ask for some constructive feed back... and be polite at all times,you never know when a job will come up again, I am always amazed at peoples memories, I once got a job on the back of a manager writing in a book after an agency shift I did, hard worker, keen to learn and my then phone number, she left the book in her desk and the new manger remembered seeing my name in it.