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Adjusting the tension on a sewing machine can be one of the most daunting tasks to hinder someone who is a "newbie" to sewing. In fact it often stops people from advancing and using this versatile & creative vehicle of self-expression.
If you already have a machine, it's imperative to make sure it's been recently serviced. Doing this will ensure your mechanics (such as the Bobbin Tension and Feed Dog - the mechanism that moves the fabric when sewing) are in proper working order and any abnormality in sewing will be "pilot error", which can be corrected through practice.
Choosing needles for a sewing machine may seem like an easy task that takes very little forethought. In actuality, needles need to be chosen on a project-by-project basis, with the weight and texture of your fabric in mind.