If you lightly press in on the bracelet in just the right location, it's a breeze!
You must press IN on the smooth bracelet part next to where is clasps shut, rather than trying to pull UP on the clasp portion itself.
Hope that makes sense!
FYI - I had to learn that the hard way. When I bought mine, I wore it out of the store and moved on to shop elsewhere. Later in the day I wanted to try on a different bracelet and absolutely could not get out of the CDC. I had to go back to the H boutique so they could free me!