The video shows aligning a cartridge with a 2-point alignment protractor. If you were to buy the Shure M97xE, such a protractor is included in the box (though a simple cardboard one, it works the same). Your manual also shows, on page 6, that the proper overhang is achieved by ensuring that the stylus tip is 45mm from the base of the headshell, then aligning the body so that it is parallel in the headshell. My preference is to use a Geo-Disc alignment protractor because I prefer the simplicity of its one-point design (these currently sell for $50; I consider mine a good value since I bought it 30 years ago at the suggestion of my Linn dealer and it has given me decades of simple, accurate cartridge alignment on a variety of turntables).
The best instructions I've seen for using a 2-point protractor is at Vinyl Engine under the heading "stupid protractors."
http://www.vinylengine.com/protractor-user-guide.shtml
How to use this kind of protractor?
Two grids and a hole: the aim is to obtain a perfect alignment with the two sets of lines and the cartridge body.
First use the grid closest to the spindle hole. Put the cartridge in the middle of the headshell; twist the cartridge clockwise or anti-clockwise in order for you to observe the alignment with the grid. When it’s right, go to the second grid.
If the cartridge must be rotated clockwise (or anti-clockwise) to be aligned with the second grid, move the cartridge forwards (or backwards) in the headshell, then go back to the first grid. Align the cartridge and check with the second grid; repeat until alignment is achieved at both points.
With this method, all of the alignment (that is, rotating the cartridge in the headshell to align with the grid) takes place at the inner null point. The outer null point basically checks overhang. As the instructions note, if you've aligned the cartridge with the inner grid but the outer grid shows you'd have to rotate the cartridge clockwise to line it up, then that means your cartridge is too far back in the headshell, so you move it forward a bit. You then align it again at the inner null point. When you check once again at the outer null point, you may find that you would now need to rotate it anti-clockwise to align it; that means you've gone too far forward and need to move the cartridge back a bit in the headshell.
As you can imagine, it may take a few attempts to arrive at just the right spot, but when the cartridge shows proper alignment at both the inner and outer grids, then you know that you have both the proper overhang and the correct alignment in the headshell. Another possible frustration is that the cartridge may move or rotate slightly when you tighten the screws holding the cartridge in place, which means you get to align it all over again. Sounds fun, doesn't it?
A one-point protractor such as the Geo-Disc simplifies the process by using some other means than going back and forth between two null points to determine the correct overhang. With the Geo-Disc, a ridge on the protractor is sighted toward the center of the tonearm's pivot point. This puts its single grid at the correct distance for proper overhang, so all that's left is moving the cartridge forward or back so that the stylus tip rests in dimple in the white circle and rotating the cartridge to align with the grid markings.
By the way, I don't think there's anything wrong with the stock cartridge, and you had written, "in the month i've had it, i can't be happier." I would suggest just enjoying the turntable as is until you've worn out the stock stylus. At that point, you can either simply get a new stylus for it (avoiding any alignment hassles) or decide to try a different cartridge. Installing one really isn't all that hard, especially once you've done it a few times (and it's nice that Denon included extra headshell wires, just in case you break one), but if you have a local shop to buy from, you can let them install and align it for you.