When you make progress toward your long-term goal, your brain – with its mental checklist of many goals – turns off the mental processes that were driving you to pursue your long-term goal. Then, it becomes more focused on getting satisfaction from indulging, because your brain feels like it has met its goal.
The Progress Trap: Why you shouldn't track your progress on your goals
Have a run-through in the space you'll be speaking at if possible and test the tech system for possible problems. For instance, the sound may not run properly with your video or your slides may be set up behind you and prevent you from seeing where you are in your talk.