small leak HELP

[gregnettles]

ok guys I am new to the 7.3 world and I must say I LOVE IT!!! It is by far my favorite truck I have had. Now the bad... I noticed a few days ago after the truck has been sitting about week that there was a small what seems to be water/coolant on the concrete. It is center and towards the front of motor so I grabbed a flashlight and looked from top and I am guessing it is maybe the water pump leaking.. It seems to be damp up by the water pump but it is hard to tell. Is this a common problem? The wet spot is only a couple inches around so it is not a big leak and like I said the truck has been there over a week in the same spot... So any ideas or suggestions would help and is the water pump difficult to change??? thanks in advance guys