Using these addi Turbo circular needles is a breeze. First, choose the right size for your project. Then, thread your yarn through the cord and start knitting as you normally would. The smooth nickel coating will help the yarn move easily, so you can work faster. As for maintenance, keep them in a dry place to prevent the nickel coating from rusting. If the cords get dirty, you can gently wipe them with a soft cloth. Just be careful with the smaller needle sizes as they don't follow standard US sizing. And remember, the US 36 and US 50 needle tips are plastic, so avoid dropping them on hard surfaces to prevent breakage.