What Jeff said. My statement was that initial setup is not set-and-forget. Once you have have your storage box stabilized and regulated, you will rarely have to mess with beads. In the beginning, the wood is going to be soaking up moisture, so it will seem like you have an issue or you are doing something wrong. You are (probably) not -- it just takes patience. Then, you may notice fluctuations and drops when you start putting cigars in the humidor, and get frustrated that you just can't keep it stable. This is also normal, as the cigars (and their boxes) are, as well, soaking up humidity and moisture. Take it slowly and have patience. As mentioned, while you are seasoning and setting up your cabinet, fill it up as much as possible with empty cigar boxes or anything that will, A) Displace air inside, and, B) Help soak up moisture/humidity inside.
There's a great sticky in the storage forum on setting up humidors.