I admit I'm a slow writer, and I think part of the reason is that I'm a pantser, trying to brainstorm ideas and put them into words at the same time. (The other part, of course, is that I goof off when I should be writing.) Still, I have been able to plow through and finish my drafts. But with both of the new projects I started recently, I've been having a particularly hard time with it. I think that's because there's still things I need to work out not just about the plot, but about some of the characters and the world-building. So lately instead of working on the stories, I've been focusing on the brain-storming and pre-writing parts. I've drawn up character sheets, developed two alien races (though there's still so much to decide about them), and even started a story outline. Hopefully this will make NaNoWriMo go more smoothly, though I fear I may throw all my prep work out the window once I do start writing. But I find the brainstorming sessions invigorating and productive, so maybe they will be useful. Maybe I won't even have to write umpteen zillion drafts before I have a decent story.
So, are you a plotter or a pantser, or somewhere in the middle? Have you ever tried to change your writing style? If so, did it work out for you?