When I started I made up about 12 quilt sandwiches of muslin and warm and natural. Each one wa about 20 x 20. I just kept trying. I found that to move the fabric and press the foot pedal to coordinate with each other was the most difficult thing.
Remember to inhale and exhale. Relax your shoulders. The machine does not need to be going at 100 mph. Try to press the pedal so the machine is running slowly and just slowly move the fabric as if you were drawing or writting your name. Eventually it gets easier. The easier it gets the more you enjoy it.