I totally agree that taking a class when you're new to sewing or quilting is a very good investment. If you're new to using a sewing machine, look for a basic sewing course. If you've got machine sewing experience, look for a quilting class.
I start my students learning to sew straight by following the lines on regular school lined paper. No thread, just follow the lines and learn to trust your machine and not fight it.. Once you can do that, taking on new tasks can be easier.