Using these ChiaoGoo Knit RED Circular Needles is easy. Start by threading your yarn through the cable and onto the needle. Then, you can begin your knitting project as usual. When using, make sure to keep the needles clean and free from debris to ensure the yarn slides smoothly. As for maintenance, avoid bending the needles too harshly as they're made of stainless steel but can still be damaged. After use, you can wipe them with a soft cloth. Store them in a dry place to prevent rusting. And remember, since they come in different sizes and lengths, choose the one that best suits your project for the best results.