How do I stretch my ears?

Stretching a piercing is a gradual process as it's important to allow ample healing time between sizes (at least 4 weeks). Stretching too fast can damage the skin which can result in scarring.

The best and easiest way to stretch without any problems is with insertion tapers. They are used to stretch up a piercing one size at a time. To stretch from 14g to 12g you would use a 12g insertion taper, which starts at 14g and gradually increases in size to 12g. Lubricate the taper with KY jelly and push it slowly through your piercing. Once the taper is all of the way through the piercing, place the jewelry on the end of the taper and push it though. Expect some soreness as your lobes heal and adjust to the new size. Wait at least 4 weeks before stretching up to the next gauge.

The second best way to stretch is called Subang Method. This is where you place one layer of teflon
tape on your jewelry. Lubricate the tape and push it slowly through
your piercing. Wait at least 4 weeks before stretching up to the next
gauge.

Will my stretched earlobe close down to its original size again?

Generally speaking, the larger your stretch your earlobe, the harder it will be to
downsize the stretch. As you stretch the flesh it naturally loses its
elasticity. Most people find that piercings of 0g and smaller can be downsized fairly easily, although this process will be gradual. Keep the skin healthy by moisturizing and massaging regularly which will stimulate the tissue and increase blood-flow to the pierced area.