I'm trying to change my water pump the mechanic said the water is not getting pumped through my engine and radiator so I got to change the water pump how do I get around the air filter and timing belt

If it's like on a Honda, and many other small cars, you will have to remove the timing belt and all that entails. This appears to be the case. I would replace the timing belt, tensioner pulley, and water pump at the same time. Get a Haynes manual, so you can see what you are up against. Breaking free the crank pulley bolt and holding the crank pulley often require special tools. If you can't remove the crank pulley bolt, the game is over.