I know most of my story. I've made numerous plot outlines. I've collected various plot devices and side story interjections to flesh the story out somewhat. I've made character list and bios and realized I've just got so many characters I feel like I'm going to rival the wheel of time before its all said and done. ( I truly do not believe that) I think I'm stuck in a spot where I want to know everything before I start writing when really most of the info I'm obsessing over wont come into play for a while. Sometimes when I'm planning I catch myself using other authors ideas.....and I'm like nope gotta scratch that. Names, names names names. I've read a great many books and I sometimes name some place or some thing and I'm like...oh wait yeah......that is from such and such, but yeah I know what you mean about plot holes they make my head spin when I think I have something nailed down and I then see that gaping pit ugh.