UK Car Repair: car repair, vauxhall astra, pulley

Question
How do i fix on a new DRIVE BELT on a vauxhall astra 1.4 N reg year 1995!!

Answer
I do not know your car.  Is the old belt still on? If so draw a diagram of the routing.  Next you have to decompress the adjuster pulley spring. This takes a long extension and a socket to rotate it back from the belt allowing you to remove the belt from that pulley. BE CAREFUL, the pulley spring is strong, so let it release under control. Fit the new belt in reverse sequence