It's fine, ease your mind a little with your work that way you can chunk it down one at a time with the story. Review the manga and the situations, I know this is Moon story and Ichigo can handle his own fight. Mention Ichigo awakening as a real substitute soul reaper and how he was thrashed him by Moon when he was annoyed, irritated, angry, and strict with his training. Take it slow and steady with your story. Ichigo hollowfication should be at the middle of his fight with Byakuya Kuchiki. When they invade soul society, let each of them fight their own battles and reunite the same way as the manga and anime as they try to rescue Rukia. While Moon doesn't interfere with them as he explores around the Gotei 13 then reunites with Ichigo and the rest.