96 Chevy Truck Could it be water pump

I have a 96 chevy truck with a coolant leak somewhere. It seems to be somewhere around the water pump. I flet the hose at the water pump going to the lower radiator. The top that slides onto the water pump was wet. How can I tell it is the waterpump? This hose was just replaced last year.

Is it hard to change thid pump? It is a v8 silverado 1996.