It's also advised to rotate your cigars at this time as well. Allow them to breathe. Filling a credo is a snap. Just make sure you use distilled water and NOT tap water. The ions in tap water break down the matrix that releases the water at the correct rate.
Some guys buy a refreshing solution to renew the matrix.
It contains polypropylene glycol the chemical embedded in the Credo. I've always found that replacing the Credo every year obviates the need for this dubious process. After you've stored your cigar properly you must then smoke it properly. The one piece of equipment you should allow an extravagance on is the cutter . The guillotine cutters have their drawbacks especially if you like smoking a cigar with a higher ring gauge.