Need to replace drive belt.Never replaced. 42'

Take a look at how the belt is installed. Then you will have to remove the mower deck and belt from the pulley on the engine. There is probably something by the engine pulley that you will have to remove so the belt will come off. It might be a shoulder bold or a rod with a bolt holding it on. Same with the rear pulley. Then you just have to put the belt on one pulley and watch your fingers so you don't pinch them and turn the other pulley and the belt should go on. reinstall any bolts you removed and install the deck.