Hi, it's a straight forward job if you know the workings of a car, with respect you do not seem to have any knowledge, Only advise I can give you without costing you money go into your local library and borrow a book on your car or bye when from Hal-fords etc, you need the tools you may even need a new belt. The belt goes around the alternator, that as you look from inside the bonnet to the right of the engine, circular with vents around the body & is alloy, there are 3 bolt to slacken then by putting a lever against the block ( side of the engine near the alternator) and slightly lever the alternator over & feeling the tension on the belt, it should be about an 1" in play.