I made the mistake of not leaving enough space for my index. I probably should have left 2-3 pages in the front of the journal for the index. Others have mentioned that it is hard to do forward planning in a bullet journal. It can be. I will often write the date for a future event in my daily task list as a note. As I review the past month when setting up the next, that note carries forward or is placed on the new month's calendar. Others have figured out ways of creating a spread with monthly calendars, but this journal is too small for that. Another difficulty is finding the monthly calendars. You can look at the index, but a long index takes time to look through. So I jumped on the bandwagon and purchased some washi tape. Just a little bit of washi tape on the edge of the paper for the month spread makes it easy to find it again. This one roll of tape should last a really long time. I found some inexpensive rolls at Walmart, but Martha Stewart has some pretty tapes too (below).
This style of journal is great because I really do use it as a mini-brain dump. Any sticky notes that get handed to me are immediately copied into my journal so I don't lose the information. Who hasn't lost a sticky note that became unstuck and floated away? Ideas that float around in my head are written down. I don't have to exert energy in the effort to try and remember something.
I'm staying more on task. Tasks are carried forward until done or until they become irrelevant. That "to-read" list has finally been collected and I'll know what books to get next. That project that I've wanted to start, now has a place to go. It really has helped reduce my stress. If you haven't tried bullet journaling, give it a look. It may work for you too.