When you're first starting out to develop your doodles, there will be many, many stumbles along the way. After all, it is doodling. Just remember there is no right or wrong to it.
I don't remember doing a lot of my early doodles, but this one I do. How long did it take to fill in all the little spaces and keep track of where I was? I'm trying to doodle with purpose here, but I've missed the point. But still, it is kind of a cool drawing...