To swap the HDD, only steps 1-9, 12, 17-20 is needed. As you re-insert the HDD, leave a spudger under the edge to prop it up against the grille - much easier to screw it back to the grille. (My mac mini has no HDD bracket)
This connector has a small catch on the right. slipping a sharp object (eg: pin) between the connector and it holder will release the catch. The connector should now come off easily.
