How Would You Prepare For an OTB Tournament

Hello Everyone,

I will be attending my first over the board tournament soon in the U1000 section. The time control is 90mins with +30s. I was wondering what kind of opening preparation should I have? I was thinking of learning King's Indian Defence for the Black pieces and variations of Queen's Gambit for the White pieces. To be honest I don't really know what to expect from my opponents and I am not sure if I can actually continue with Queen's Gambit if my opponent doesn't play 2...D5? I bought a few chessbooks

• Modern Chess Openings
• Silman's Complete Endgame Course
• The Amateur's Mind
• The Mammoth Book of The World's Greatest Chess Games

 Honestly I'm just looking for any advice you would give to someone on how to prepare / what to expect at a first tournament.

Thank you for your feedback and time