Put the knife down!!!
If you have a candle warmer fine..but if not a coffe pot will do...lay the caps with teh flat metal...a few at a time..on the heated coffe pot...teh warmer part. Use a dishtowel as they may be hot from laying on the warmer...you can judge how long to leave the caps there according o your coffee maker. Use your dish towel to handle the caps and one by one using either a butter knife... i use tweezers just slide the plastic ring off....yup it will just slide off...if part of it is still stuck to the cap set it back on teh warmer!
Hope this helps!