Changing the timing belt on a diesel engine is NOT an easy thing to do. Get it wrong and you could turn your engine to scrap very quickly. Your questions suggest that you're not very experienced at vehicle maintenance (no offence) I would strongly recommend you pay a pro to do this job. Start on oil changes, brake pads and suspension bits they are a whole lot easier to do and don't require special tools. A Haynes manual is well worth buying in my opinion.
Richard, December 2008