By now your skeletons should be rattling with ideas and your plot should be forming. Story metamorphizing along the way. And those prepping more than one idea are brave. Wait, that'd include me with my plan on prepping Book 2 after Book 1 is finished. Get it all out there and do the best you can do. Don't force yourself to do it. Skip if you have to as long as you get them all done in the end. You can do it!