It's not hard at all. If it's a bluetooth headset, set your blackberry's bluetooth to enable and hold down your on button on your headset until it starts blinking. The blackberry should recognize it from there. Also the blackberry will ask you to search for the headset, go ahead and do so. For a gps, it's the same way, just cut it on and search for it.
And I apologize for not reading all into your post. That part for the desktop.......I haven't tried.