u/Conscious-Sport-6778

I need help with picking out equipment for an upcoming gig.

We are a 2 person group, myself on guitar and vocal, and the other person on cajon (a drum you sit on) and vocals as well.

So far we only have 2 amps and 2 mics. One with a single input for the guitar, then the other has 2 inputs for the vocals.

I know we need a way to mic up the cajon, so I guess another amp and mic.

I really don’t know what I’m doing when it comes to equipment like this. Do we need a sound board for audio balancing? One dedicated amp that everything feeds into? Any advice, websites to learn about this, or product recommendations are appreciated.

I've noticed a behavioral pattern that I have where anytime I make a mistake, I get irrationally angry with myself. I know it's not rational to hold myself to an incredibly high standard and then lash out when I fail to meet it, but I can't seem to stop the anger from arising.
For example, I take online classes in my free time because life long learning is important to me, but if I get a single question wrong on a quiz or test, I just get mad at myself and start a spiral of negative self talk, depending on the day and if I'm alone I'll just start yelling about how much of an idiot I am.
Or if I play a game with someone else, like chess, I'll get upset at any minor mistake I make to the point where I'll sometimes be mad even if I win because "I should have played better."

The frustrating part is that I KNOW I need to see failure as an opportunity for growth and not a character flaw. I KNOW that a few mistakes does not a failure make. But it still just sends me spiraling sometimes.

Does anyone have advice on how to break this particular cycle to try out?