So a search of the forum for assistant briefing advice, been a lot of discussion on it lately.
Great bit of advice I was given by a senior colleague about preparing for middle in a cup final:
Make sure to phone your team of officials 2 days before the game. Arrange travel and when you want them at the ground. Shirt and tie, boots polished, confirm all the things that make a good first impression.
Secondly, phone the fixture secretaries of both teams playing. Introduce yourself if they don't know you, Congratulate them on getting to the final then friendly reminder about if they need to bring a set number of match balls to the game and that your team will be hot on checking player equipment; can they "do you a favour" and remind their players that tape needs to same colour as sock underneath it, under shorts same colour as shorts, sleeves on under tops need to be the same colour as main colour of team shirt - after all this is a show peice game of the season! Any questions, good luck, I'll see you at the match.
That second bit of advice is genius and works a charm.