College or work? It should be obvious...

I recently opened my e-mail and found something interesting. It was a mail from studera.nu where they mentioned my application for the German course at SU. What I didn't understand was if I was accepted or not? I know that I desperately want to go back and study and that the German language is something that interests me greatly, but I fear that I have fallen into the comforts of having a job. Meaning; the fact that I actually have nothing special to do on my free-time, I get an income per month that is bigger than the studiestöd, I don't have to feel tied down to something at all, etc. 

I think that I have become what I didn't want to become and that was a person who starts with a gap year and ends up with gap years for the rest of her life. (However, I'm not at the "rest of my life"-part yet.) I thought about how this would affect my job. I don't know what hours the course covers, it's a 100% study tempo meaning that each class is mandatory (unless your sick of course - they can't force you then). I do have the night shifts though so I suppose that it should work out if I want it too. But still...

How would that blend in with work? And what do I say to my boss? I think it would be a short notice... What do I choose? Education of course! But it's not like it's a set program, it's only a semester of language. And there are things I want to save up for that I don't think I'll be able to if I study full time. What do I do and how do I solve this?