The hard drive on mine was physically screwed into the drive carrier -- I could not just pull the drive up and out

Instead I had to remove the logic board fully -- which involved disconnecting the power cable to it and pulling it out.

Once the logic board was out, I removed the power supply -- which involves turning the power connector (the connector that the line cord to a wall socket connects) 90 degrees -- the power connector is keyed so that it unlocks the power supply when rotated

Once you rotate the plug, it just comes straight out

Now you can remove the entire drive carrier assembly. Once out remove the four screws holding the drive in and remove the drive. You then can transfer the drive cable to your new drive and reassemble. It's actually fairly straight forward

In my case the two center screws on the antenna cage do not physically connect to the drive. They're just held in place with rubber grommets and do not screw out. All you need to do is remove the outer two screws and the antenna can be removed