How do I make sure it will all work on the day?

Do a dry run, well before the day. It is the only way to be certain, because it tests everything at once: that your channel is really switched on for live streaming, that your streaming software can reach YouTube, and that Setnayan can show the result.

1. Make a test broadcast on YouTube, exactly as you would for the real thing, and set it to Unlisted.

2. Start your streaming software and send pictures to it.

3. Paste the watch link into Setnayan and open your celebration page on your phone. If you can see yourself, everything in the chain works.

4. When you are done, end the broadcast and delete the test video if you would rather not keep it.

A dry run also proves the 24-hour activation has finished, which is the single thing most likely to go wrong on the day. Do it once, any time — a year ahead is fine — and you never have to wonder again.