Tension is very important, the yarn must be able to glide smoothly from your left hand to the working project, not too tight not too lose.
You will need the following:
Step 1: Start off with a slipknot. Prepare your yarn tensions on your left hand (right either whichever is your orientation)
Step 2: Hold the slipknot with your thumb and middle finger and pointy finger controlling the tensions.
With hook in the loop, yarn over and pull up a loop.
Step 3: There you have it, and that is all there is to it.