I just did the install yesterday. A million times easier than in the past. In fact, you can't really even compare it.
1) Lift the latch on the bottom of the computer
2) Pull the panel off
3) Use a #0 screw driver to remove a holding tab
4) Lift installed HD and disconnect SATA connector
5) Use a Torx T6 to remove mounting screws from previous installed HD
6) Reverse process with new HD
7) Done
The entire operation takes maybe 5 min max.