Be prepared with supplies to try several methods and find the best one for your quilt and your machine. My eyes have a hard time with following the blue tape line for long periods, but it works really well in positioning the lines correctly.
In the middle of my last quilt, I used both painter's tape and the walking foot guide for those long diagonal lines. I would alternate painter's tape, then the guide. Even with a slippery surface and extended table surface, I needed all the help I could get to keep the lines straight for the middle section. As I worked my way out to the edges, I was able to use the walking foot guide more often.