Here are a few things that I have found that have helped me.
1. Use Erasable Pens!
I use Pilot Frixion pens because the write smoothly and I like all the colors.
2. Print on Post-Its!!
Such a cool idea! And So EASY! Click here for a how-to.
And inspirational quotes to keep me on track.
3. Print pictures of important events on labels and place them in your planner to remember and look back.