Yeah Bob, you're probably right about the 'buying' thing. And I don't blame the Sibelius guys for that, it's perfectly reasonable.
The point is, I just don't have the money at the moment. But, when I have plenty of cash I probably will buy it, it's definitely awesome software!
Thank you very much for the suggestions about scanning the sheets, I will try that! And if that doesn't work I will notate the sheets myself, by hand, and try to save it as a MIDI-file.