Well your printer should have a choice to make it like able to be seen by other devices, @ that the point have the BB search for BT devices and cross your fingers.
The problem is there are no print options on the phone unless I'm missing something. I think you have to send your files to a computer and then print from there. I actually asked this question quite a long time ago and the answers I got then too were that it's not possible to print directly to the printer.
I don't see it happening, unless it's a 3rd party app. There just isn't a huge demand. Most people would just email it to the computer (if there is a printer I'm assuming there is a computer) and them print it using the pc.