The rhythm hand deserves some extra love! Stop telling yourself that someone will take care of the heavy lifting with guitar. Stop being the weak link in the band. Learn to play the damn guitar! It's nothing complicated, so don't feel overwhelmed. You just need to dedicate a little additional focus on specific techniques.
The first night of practice/trying is usually a major let down. It doesn't have to leave you wanting though! Read this for a few quick tips on getting the most out of a first practice/try out.
Let's face it, practicing scales sucks. It sucks real bad. It doesn't have to be this bad though! I have listed a few of the fun ways I like to practice my scales.