Every once in a while I do a vanity search on my username to see all the gossip about me, and this came up, so why not reply to it?
Grab a piece of paper and a pencil or pen, and get to it.

Really, it's pretty much that easy, just look at what you want to draw and practise, I think Stormrider says something similar quite often in the artists thread.
Yep, that's what I say. Wishing you could do something gets you exactly nowhere. Without trying to be too pompous, I sometimes get people saying, "man I wish I could draw like you". My answer is always, "Don't wish! Wishing doesn't make
anything happen! You need to sit down, grab a paper and pencil and start drawing! No matter how much talent you have, advice you get, expensive tools you buy, mommy-pats-on-the-back you get, you will NEVER be a decent artist if you don't practice, practice, practice. It's extremely important that you love what you do, even if you start out absolutely worthless (we all did).
I think the key to being a good artist is not having the ambition to be a decent artist, it's having the acceptance that you're a worthless artist, but loving it nonetheless.