Using your addi Turbo Circular Needles is a piece of cake. Just thread your yarn through the needle and start knitting as you normally would. The nickel coating helps the yarn glide easily, so you can work on your project faster. When it comes to the different sizing, make sure to double - check the actual size as some smaller needles don't follow standard US sizing. As for maintenance, keep your needles clean by gently wiping them with a soft cloth. Avoid using harsh chemicals as they may damage the nickel coating. And since the US 36 and US 50 needle tips are plastic, handle them with a bit of care to prevent any breakage. Happy knitting!