I have a natural disposition to be like that and I fight it by simply making a mess. Grab a big brush loaded with ink and start "drawing" with it. That blob wont go anywhere but you can begin to "fix" it by gradually utilizing tools that leave smaller marks and draw over and around the big mess of ink you just made. If you try to use a really fine pen after the big brush, you'll see that it looks like crap so it'll actually will be quite easy to go with bigger marks. This is for me a quick, natural and quite pleasing way to practice getting hung up with useless details from the beginning of your drawings. After a lot of the page is black use some white-out to carve out details. Once you begin to feel comfortable (actually having fun) with this process you won't feel so pressed to start noodling right away, I can guarantee it!