I was offered a bass gig with one of my favorite nashville bands 2 years ago. I was offered the gig based solely on my personality - I was friends with the band and they were tired of taking grumpy bass players on the road. They knew we'd all have fun and get along. BUT I had never played bass before, only guitar. In Nashville, that's no excuse. You just do it. The band gave me a list of 30 songs, mostly original material, mostly country and honkytonk material. So the bass lines were all, for the most part, country. I had 3 weeks to shed before our first 5 night tour. I split the list in half, promised the band I would have 15 songs for the first rehearsal. Motivated by: (1) fear of embarrassment, (2) the desire to keep the gig, (3) the desire to become a better musician, (4) Nashville expectations -- I learned the country bass style and soon discovered that what seemed like a lot of notes to my ears was actually formulaic patterns. I showed up after one week to the first rehearsal and nailed 15 songs. One week later, I showed up to the second rehearsal and nailed all 30 songs. We had a dress rehearsal gig, then went on the road. It went great. Fans familiar with the band knew I was a new face, and everyone asked me how long I'd been playing with the band. Nobody knew that, at the time, I'd only been playing bass for 3 weeks. the moral of my story: Jump in and swim. But don't be stupid. Do your homework. It's the only way to get anywhere.