I have this problem with saying no to people, which I have always known, but lately, it's become more and more obvious to me (perhaps because it has also been more frequent??). In my head the words "no" form loud and clear, but some how the signal from my brain to my mouth gets confused and it comes out as "no problem" instead. This is specifically a problem with many of my friends, but the problem also extends to advisors and other people in authority positions (e.g. practicum supervisors). In most cases, it's not a big deal to help out or do whatever they've asked, but it's more of a principle thing. And training, if you will, for the bigger things, which I am still often unable to say no too. Enter my problem of getting myself over committed in projects and extracurricular activities.
So, I turn to my faithful readers to ask for suggestions... graceful (or even just effective) ways of saying NO! to people who ask for my time, energy, work, and anything else I don't really want to give.