Hi Will!
About "not always good at it" : Great! Me neither.
Ira Glass on public radio has a great comment about that: it's 'cause your taste in art is further along than your skill. And the only way to get caught up is to do it, do it, do it. And grab ahold of example you like and mess around with techniques and make about fifty gazillion mistakes.
Another artist I like, Ursula Vernon, says all work an artist does -- whether good, bad, indifferent, independent, or never to be seen again -- is mulch for the next bit, or the one after that, or ... Love the idea of art as compost.
Cheers to getting your stuff out, to pushing yourself, to winging it!
Kir