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Get a countdown timer video in high resolution queued up on your projector well before midnight, ideally synced to an audio feed so the sound's crisp when the moment hits. You'll want to test the whole setup the day before to avoid any tech fumbles when everyone's gathered around - nothing kills the vibe like scrambling with cables at 11:59. Keep the image large and centered so it's impossible to miss, and maybe dim the room lights a bit so the projection pops. If you're worried about internet cutting out, download the countdown file beforehand rather than streaming it.
The one thing people always underestimate is how much ambient light kills your countdown video. Even a fairly bright projector looks washed out if your living room lights are still on, so dim everything way down ahead of time and test it during daylight so you're not scrambling at 11:55 PM. Also make sure your audio sync is rock solid - nothing kills the vibe like the countdown numbers on screen finishing a full second before the sound catches up, which happens more often than you'd think if your projector and speakers aren't properly calibrated. Practice the whole sequence a few hours beforehand so you catch any lag or sync issues while you can still fix them.
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