YES DO IT!
I’m sure you’ve read here that u never feel 100% ready.
I was soooooooo not ready for my first gig, same situation as yours.
For you first gig make a playlist and practice, practice, practice.
Don’t drink too much, even if u r nervous.
If you’re finished u know u would regret if u had not taken this chance, even if it was like a jump into the cold pool
(do u say that in english? its a german saying)
good luck!