Not too bad, but getting the CCM off your first time (or if you haven't done it in a while and forget how it works) can be a real challenge. My advice would be to use a bone tool to leverage it off. It kind of lifts out and up if I remember correctly. Much patience is required. And DO NOT disconnect it unless you want an SRS service light that needs to be reset.How easy is instalation?! Including getting the Hu out with out breaking anything then hooking up the grom?!