I leave post it notes whereever I go. I'm a pretty organized person with good follow-through, but it takes EFFORT to be so. I don't say that to be discouraging at all, only that sometimes people who seem together make it look like it's natural, when it's not!

I also email myself reminders all the time. Because I know I will see my emails. So if you can email yourself when someone asks for something, that way you'll see it later at a time when it will be useful to you. When you're in the middle of something is not the best time to try to remember things. Good luck, you can do it!