I'd add, google image the venue ahead of time and try to get some images around the sbd area. It's nice to see what you are working with. Seams that tripods are getting some shade these days, so an area to clamp can be real nice. Also, look on Live Music Archive for other recordings at the venue you are hitting up. Often they have the blueprint spelled out for you. I also like to have the bands taper policy on my phone, just in case you need additional exhibits for your case. I've had a lot of luck over the years reaching out to smaller touring bands on Facebook Messenger. Let them know your stoked for their show, and you want to get their permission to tape it. Be sure to tell them you will post it to their page on Live Music Archive. Often they will leave your name at the door. You will feel like a king walking in the venue knowing your name in on the guestlist!
And...rehearse your BS. "It's just audio...Hell, I can't even figure out the video on my iphone"; "I record the live shows for the band"; "The band wants me to do this...I taped their Austin show last night and Houston the night before"; "You don't want Dallas to be the only show that doesn't get recorded on this tour?!". You get the picture. Good luck moving forward. Just know that pre-show anxiety never goes away, and your local venues are where you build confidence, so get out as much as possible and make friends with the local sound guys. Welcome to the Jungle!!!