"just keep practicing, it'll come to you as long as you maintain good form."
My thoughts exactly. Especially with emphasis on the good form. DO NOT get caught up in the trap of thinking you have to shoot fast, shouldn't "aim", or that you can anchor or draw sloppily and still hit. Common misconceptions in many cases when new shooters are trying to learn instinctive shooting. Work on consistent form, a solid repeatable anchor and a rock solid bow arm. A smooth release and good follow through are needed too. When you can shoot with all aspects of form executed correctly without much consious thought, your accuracy will just start to come on it's own. You'll also be able to start messing around shooting from awkward positions and doing more of the "instinctive" stuff but you HAVE to get proper form ingrained first.
Realize too that for some people it may take several years. Just depends on how serious you are about proper shot execution. The more emphasis you put on proper form to start, the fewer bad habbits you will pick up and the fewer things you will have to relearn a year or two from now when those bad habbits are ingrained. Trust me, I know about that part all to well....