Thank you for this guide. I appreciate the time you took to photograph this and document it.
Don't take notice of the I did it in 10 minutes brigade, replacing the HDd might take 10 minutes but the other jobs will take longer.
Also those that are dissing the author re screws etc. The screws are different lengths. Take the commentators hint and use an ice cube tray, label it 1, 2, 3, .... and put the screws in there. THe difference if 1-2 mm is enough to have a slightly long screw go through a component and kill it.