But seriously now, as I’m fresh out of the “band experience”. And believe me, you have to be prepared that it can be a really bad experience.
I don’t agree with Josh that everyone is always ready.
No, you have to BE really ready, be able to play at a decent level. Otherwise, you’re going to have a series of humiliations and embarrassments. People will mock you, bully you, laugh at you. You will be their punching bag.
I started playing with them in February, because after almost 4 years of hard practice in my room, I wanted to start playing with people. I was the weakest point from the beginning and the first rehearsal was a complete disaster. I cried for 3 days and gave up music for a week. But somehow they still wanted to play with me and I stupidly agreed.
Because I listened to people here, was convinced by my husband and teacher. That it would be great later, that it is learning path blah blah blah.
The next months passed, for me it was unimaginable stress, I did everything I could to keep up with them, I practiced at night to improve. Listened to the recordings from rehearsals and felt worse and worse because I clearly stood out as the weakest one.
As a result I lost weight because I couldn’t eat, I started getting sick because my immunity dropped from stress, I’ve had 2 rounds of antibiotics. After yesterday’s experience (listened to recording and I sound like a 7 year old who pick up bass for the first time) I’m leaving for good.
Was it worth it? No.
Was I ready? No.
What did I learn from it?
That I still don’t know anything, can’t play, and that I’m not ready to play with people.
I’m considering quitting music, but maybe I’ll wait until I calm down.
Seriously this forum gives me depression, when I read people’s experiences here, I feel worse.
You are all like geniuses, everything works out for you, after a year you can play concerts with your bands and and it’s wonderful. And it’s all without any effort, because bass is the easiest instrument and everyone can play it 
Meanwhile, for me it’s a torment.