I learned to knit with a looser tension by switching to bamboo needles for a small project.
It was just impossible to move the stitches until I relaxed my tension on the yarn. Then when I returned to my metal Bates, I was a loose knitter and the projects just flew along on my needles.
Of course I now much be careful with my WIPs so they don't slide right off my metal needles. :oo: