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Its not life and death, you can go out for a few laps to get them warm and then come in and change the pressure up or down if required.

To be honest, even if you did bin it, I'm sure that the organisers and or people there would be able to give you a lift somewhere. Even if you paid a recovery van to take it home, it's still probably less than trackday insurance.

If you plan to ride there and home then make sure you anticipate a long day, so get plenty of sleep and try to relax off the bike. Avoid going mental on red bull and sweets!

When you ride home take it easy because you will be used to ragging it by that point.

Most importantly, just relax. You're there to have fun. Do it! £59 is a cheap way to get started.