Using these KnitPro circular needles is a breeze. Just thread your yarn through the cable and start knitting as you normally would. They're great for both delicate lace patterns and regular knitting projects. When using the cables as a ruler, simply align them with your work to measure. As for maintenance, keep them clean by wiping with a soft, dry cloth after each use. Avoid bending the needles too forcefully to prevent damage. Store them in a dry place to keep them in good condition. And don't worry about the packaging change; the quality of these tools is still top - notch.