I volunteered at the bike check last time before riding it.
Just make sure your bike works properly with two brakes and two lights (one red, one white and mounted on the proper side) and is in one solid piece like you mean business.
Those with a dynamo, Mrs Somnolent this is for you and Mr Somnolent, make sure it's connected at the hub thing and actually shines a light. This will speed your progress through the bike check and the friendly checker chap won't have to perform mechanic duties.
It's fucking hard work standing there for two days looking at stressed out peoples push bikes, so be kind and do the checkers work for them beforehand.
Top tip.
If you relax on check in day and turn up later in the day for the bike check you won't have to stand in a queue and will sail through. If you get caught in the queue check your bike yourself before you get to the tent.
Remember, there's plenty of time.
Breathe........................and relax.