I'm going camping in Gangwon-do for the first time tomorrow...

I've booked an auto-camping site by the beach in Goseong, Gangwon-do for tomorrow, but I'm a complete beginner who has never been camping before.
My girlfriend said she has all the gear, so I'll be loading everything from her place into my car.
Is it difficult to pitch the tent and set everything up once we get there?;;;
For reference, I've pitched plenty of field tents during my military training lol
They say it's going to rain tomorrow, so I'm feeling a bit overwhelmed;
My girlfriend has all the gear too, but she's only actually been camping three times...
Camping experts, please share some tips.
Anything helps lol