do you think the 9 month course will really prepare someone for a major in Polish? I don't want to set myself up to fail. I have been practicing Polish for about an hour every night, but just basic stuff.
It might, but you'll need to put the hours in with self-study - the course itself won't be enough. And a lot will depend on you - with languages, it's impossible to say if you'll be good enough or not. Bear in mind that you'll also need "academic" Polish - it won't be enough to simply be able to use every day Polish.