Using these addi Turbo Circular Needles is easy. Just thread your yarn onto the needle and start knitting as you normally would. The nickel coating helps the yarn move smoothly, so you can work on your project without much hassle. When it comes to sizing, double - check the actual size as some of the smaller ones don't follow the standard US sizing. As for maintenance, keep the needles clean and dry. You can use a soft cloth to wipe them after use. Store them in a safe place to avoid bending the cords or damaging the needle tips. And remember, the US 36 and US 50 tips are plastic, so handle them gently to prevent breakage.