Had my iPhone 4 since launch day and I've noticed that my home button isn't as clicky as it can be. Compared to other models I've gotten my hands on, it's somewhat squishy feeling and doesn't sound and feel as responsive. Kind of more like a 3GS home button. Question is, how difficult would it be to open it up and adjust the clickiness somehow? I plan to use ifixit instructions. First timer opening the phone up.