Forgetting stuff - make lists. Lots of us do. No shame in doing that. Sit down when you're not busy and just list everything you need in order to get your job done. If necessary, as you go along, you might find you forgot something. That's fine. Just add it to your list.
Once your list is complete, make several copies of it. Keep one in a pocket or your purse. Another at home. If you've got a locker at work, tape one up inside it. You get the idea. These are reminders and, if you forget your list, you're still covered.
As for accidents, they tend to happen when people are distracted or are in a rush, or haven't gotten enough sleep. If you need to go to bed earlier in order to get up earlier so that you're not rushing so much, well, then go to bed earlier. Trust me, TV isn't going to get any better and you can watch most of the stuff you miss on Hulu anyway.