It is MUCH easier to just align the bottom edge, then use painters tape to attach the glass at the bottom. Flip the screen forward so that you can see both tabs 4L and 4R. Carefully expose the adhesive at the bottom. Connect the two top cables, clean the webcam. Finally peel tabs 5 and 3 from the bottom up. Lastly while you can see everything, peel both sides of tabs 1 & 2. Then just press everything down squarely. (The biggest issue is that the tabs do not come off easily and removing the tabs while you can see them is the key here.)
Also used a WD Red 3TB/SATA3/64M/3.5. Model WD30EFRX. ($129 at MicroCenter) Fit is perfect and performance is outstanding. Directions are fine except the rubber base is glued pretty strongly and is a bit delicate when peeling off. Didn't use a heat gun, just patiently and slowly peeled it back.