Hey, Caprice! Well, "ll" is slightly diferent in Spanish, they pronunce it more like an "i" (-ee- in English) and they don't really know how to pronunce it in Catalan, at least not like we do... My dictionary of English-Catalan says the "ll" is like in the Italian "foGLia", if that helps. Sorry, I'm not a big help...ok, I'll try to explain you how to put your language to pronunce the "ll": you have to press softly your language against your palate, just above your teeth.
Does that make sense? I hope so! Well, I'll think about something better, ok? Glad to help you, and don't hesitate asking about anything you're interested in, ok? (As you can see, I love talking about languages!!!)
Oh, and don't worry too much, there are lots of people here who can't pronunce the "ll" properly...I couldn't when I was little (actually, I couldn't pronunce the "l", the "ll" and the "rr"), but after a speech therapy I got to do it, and I was only 3 years old! The therapist was really surprised with my abilities ;-P!!!