Dunno if this helps or not, but many years ago some friends of mine had a band that lost its bass player. They asked me to get a bass, learn the material and fill in. The agreement was that if I could get up to speed and they hadn't found a better player I would get the gig. I did so and struggled mightily for the requisite two months. They were very helpful, understanding and grateful. Ultimately they found a phenomenal bass player and I did not get the gig, but it was still a very positive experience. Unfortunately speedcore punk was just too much for me to get a handle on in 60 days.
Shortly after that another band needed a bass player and asked me to try out. I told them of the experience I had had a couple months before and said that if they would be willing to work with me, so long as I would be willing to work harder than them to get up to snuff. This was an "Adult alternative" project, IOW the music was too adult for the alternative crowd and too alternative for the adult crowd so everyone hated us. It wound up being a good match, my tastes and preferences brought some heft to the music and I even contributed a few songs that wound up being well received by both our fans.
I suppose the end of all this is that a positive attitude trumps just about everything else so long as a person has some solid rudimentary skills. I was in a Guitar Center the other day and noticed that all the "Musician wanted" postings were for bass players. Apparently we are in high demand and as long as we are easy to work with and have a good work ethic, I think that would go a long long way.