I have a longbow and I do archery on my own here in our yard (being from Archenland I am skilled at many of the arts of weaponry you all aspire to) we have eight acres and feilds all around us so my biggest problem is losing arrows not shooting them into something I shouldn't.
and archery is easy just imagine a line going at an angle that is equal to the angle you percieve your arrow to be and set your target accordingly then adjust slightly for wind and distance and release.
my short version of how to accurately shoot (sorry if I made it too complicated, and I love writing in Narnian style.)