It was scary relying only on our other senses. But we pushed through by helping one another.
We came out really appreciating the gift of sight and learning things about the blind that we had never known before.
As a side note, if you need to use the restrooms, you need to get the key from the receptionist.
If you are looking for an unusual thing to do while visiting HK and have time to spare, you should give Dialogue in the Dark a try. It is not a typical "touristy" attraction.
There are also "Dinner-in-the-Dark", "Silent Yum Cha", and most recently "Birthday in the Dark", "Silence le Cabaret", "Concert-in-the-Dark" , and "Love-in-the-Dark" too. We were quite bummed that our visit didn't coincide otherwise we would have definitely booked either of the first two options.