The crystal wall hooks will need to be fitted on the wall. Different hooks have different fitting mechanisms. Some are simple while others may require some level of skill or a hired handyman. As a buyer, you don’t want to spend a lot of money on installation. As such, it may be a good choice to buy simple wall hooks that can easily be installed on the wall without any problem. It should be a kind of plug and play mechanism. However, this shouldn’t affect the strength of the hook once it’s on the wall. After all, some hooks may be used to hold heavy stuff including filled purses and backpacks. This means that you have to make sure they are strongly fitted.