If you want to get into the argument between bows and guns...
Both bows and guns require upkeep, but there are guns that don't require much upkeep at all. The AK-47 was designed so that you could throw it in a sand dune or in a marsh and then pick it up 3 years later and it would still fire.
Bows require upkeep, and since they are wood are not as durable and are more prone to the weather (warping and cracking). Todays compound bows need to be kept up because of the pully system they use. Composite bows were very well made, but note that you had to know how to make them and they took a long time to make. So did english longbows.
As for actually using a gun, its pretty much line up the sites, point the sites at the target, and pull the trigger. Is it hard? Its definitely not easy, but once you get that concept, its just a matter of practicing your shooting.
Some might think for a bow all you do is aim, pull back the string and let go. But you have to realize something: A bow is a LOT HARDER to aim. Why? Two reasons:
1) Physics. A bullet has a flat trajectory for about 90% of its flight, so point and shoot works. As for a bow, thats not true since its relying on your muscle and the flex action of the bow. You have to aim above the target, and the distance to the target affects how far above you aim. Its exactly modern artillery shells only the distance is much shorter. And with a bow you don't get the benefit of handy dandy trigonometry charts to figure out how high you should aim.
2) When sighting a bow, the line of your eyes and arrow do not line up like the sites on a gun. You have to guestimate using experience and 3 dimensional plotting in your head!!! Then you have to practice this at different ranges and on moving targets and train your brain to understand what you have to do in each situation and extrapolate.
And this doesn't include understanding how to draw a medieval bow. Today's compound bows are easy to draw back, but composite and longbows of old require quite a bit of strength (draw the bow back with your whole body, not just your arm!)
And don't get me started on how a newbie would get his forearm smacked hard if he didn't understand about stringslap!!!
Okay I'm done
