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Dough Wetness
The wetter the dough, the easier it is to pull. If you are having trouble getting the dough to be stretchy, add some water. You'll want the dough to be wet enough such that it will stick to the counter or your hand if you let it sit for 10 seconds or so. After that, if you add more water, it will make it too difficult to handle and it will stick to everything.
Warmth
Warmer dough is stretchier. The warmer you keep the dough as you're trying to pull it, the better off you'll be. It isn't necessary to pull proper noodles, but it can make the difference if you're just getting the hang of it.
Practicing
You can practice with the same piece of dough for hours. If it gets too dry, just wet your hands or dip the dough in some water to rewet it.
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