Using these addi Turbo circular needles is super easy. Just thread your yarn through the cord and start knitting as you normally would. The smooth nickel coating helps the yarn glide, so you can work faster. When it comes to needle sizes, be sure to double - check the actual size as some don't follow the standard US sizing. As for maintenance, keep the needles clean and dry. You can gently wipe them with a soft cloth. Avoid dropping the needles, especially the plastic tips on the US 36 and US 50 ones, as they may break. Store them in a safe place to prevent any damage to the cords or joins.