This is more ELR match-day tips:
Watch, listen, learn, have fun.
Spotting is a great skill and takes time to develop. Stay on glass as much as you can (without slowing down your squad). You can learn a ton glassing for others shooters. I prefer nice binos less fatigue and you can watch it all the way there instead just focusing on the target.
Keep your scope at he same magnification as your binos when you start a stage (10x=10x). Things will look more familiar and help you get on target quicker
Since you're F-Class (square range), your wind flags / indicators are natural. Grass, trees, leafs, dust, mirage, ect. Sometimes these will lie, so pay attention and be ready.
Be prepared that your dope might stop working at certain distances
Don't loose you shit. Ask your squad-mates for help if they are cool.
Bring some paper dope sheets while your at it. cant hurt and the batteries last forever. Hopefully you never need it, but cant hurt to have and if its tracking, much faster getting ready for a stage.
Make sure you do the little shit right and right every time. Pay attention to trigger control and body position for every single shot.
Make shots count and don't give away easy ones. Better to time out with 3 hits than shoot at every target and only hit 2.
Each shot is it's own adventure. Last shot has absolutely zero influence on the next one. Once it's gone, it's gone. Forget about bad shots right away.
Get your 1st shot off quickly. Sub 30 seconds is good. Bank that time. However, see above advice.
Know your course of fire. Draw a map of target position if you need to.
More spotting and glassing.
Eat more snacks, drink more water.
Don't forget, it's supposed to be fun.
Chair is a good idea.
Snacks. Water, lots of it.
We carry a mini folding stool (aka: Barry-chair). Light, cheap and easy to pack.
Lots of calories, salt-tabs or electrolytes, snacks, protein snacks, sunscreen & lots of water. Eat and drink even if you don't feel you need it. 1st thing dehydration effects is your vision. You cannot manage the conditions and wind, but you can manage your body.
If you are coming out west, be ready for wind, dirt & dust all-up-in-your-shit. Have a plan to keep it clean and running.
If you can find one person in your squad that you can trust to spot for you, it's way better than 6 people in the peanut gallery telling you different things. If you're "not sure" or "think it was..." just keep you mouth shut. Bad info is worse than no info.
Don't worry about gear. A lot of shooting is between the ears.
Have fun.