I haven't had the nerve to try the oil/filter change yet, even with just over 24,000 kms in just over a year of ownership. My theory is that if anything goes wrong, I can know with certainty that all of the work has been done by the dealer, albeit at some pricey charges. Next July I feel I'll have the "guts" to try some service myself. I would strongly suggest that you have the belt checked by the dealer, though. That is a very important piece to not have operating correctly. And .. as for your RIGHT answer to your wife, Well Done!
I found that changing oil wasn't as difficult as I thought it would be. I took my time and checked off everything that needed to be checked with the first service. I go to my dealer tomorrow and he will check codes and belt. He encouraged me to do my own service to save money which I appreciated. I don't always have the right answer to my wife's questions!