i forgot to add that we are trying sour girl. i guess any suggestions of any type from soft to hard will work. we will just edit the set list concerning each venue.
I think if you guys are just starting you're biting off a lot going straight for sour girl.
Try Crackerman or Unglued and then work on the harder ones. STT and Sour girl have are much more punishing on screwups for guitar and vocals.
So what kind of range do you have? Can you compare your vocal range to another singer? I'm guessing you're more of a mid/upper tenor if sour girl is more comfortable for you than STT. Also which parts of STT are you struggling with.
Be sure you're doing some vocal exercises/warm ups on your pipes before you start.
Also just some general advice, unless you are specifically an STP cover band, don't play more than one cover by the same artist at a show. Its tacky.
Really, once you are playing out, unless you are a coverband playing at a bar, you should be playing 90% original works. In the long run, you'll gain more fans that way.