We never stop improving with this process so I hope you will not give up. I was too frightened to begin, as I didn't want to wreck what I thought were nice quilt tops. I practised on charity quilts mostly and now get asked to do quilting for other people. I'm really complimented that these folk think my quilting is good enough that they ask and pay me to do the quilting for them. There was a time when I thought this wouldn't happen as well!
Just practice for a short time every day, and not for such a long period that you get really frustrated with it. There has to be some fun sewing thrown in there as well. Why not start on another top that you can alternate so that you are having success from time to time?