OK, I had to try this myself and share with the group as it is honestly quite a simple install/upgrade.
Make sure and remove the coil cover in such a fashion that will not damage the gasket on the cover, or displace it.
Carefully lift one of the coil/boot assemblies from the spark plug cavity paying attention not to pull anymore than necessary on the wiring harness. (I used my other hand to bend the rubber boot when removing from the spark plug cavity, making it a little easier).
Seperate the wiring harness by pressing on the top tab while pulling the two halves away from one another.
Remove the rubber boot from the coil pack by rolling the rubber down and away from the coil pack. This was the hardest part and took the longest. While the rubber was rolled away from the coil pack, use a twisting motion back and forth while pulling, and it should finally break free, exposing the OEM spring.
Carefully twist and pull the spring closest to the coil pack until it comes free. (The spring will more than likely bend upon removal as they are very weak). You will then be able to see the 'tab' that holds the connector in place.
Place the Granatelli connector over the 'tab' and press on. (This is a tight fit. Make sure it is on all the way seated).
Slide the boot over the connector ensuring the coil pack and the boot mate together as shown:
Replace the wiring harness back onto the coil pack making sure it is fully seated. (You should hear a 'click' when seated correctly).
Carefull locate the boot end into the spark plug cavity until you feel it touch the end of the spark plug. Now, I had to press using quite a bit of pressure until I heard the connector 'snap' onto the spark plug. (I made sure my thumb was centered on the coil pack and placed my other thumb over top using both hands to press).
It appears the Granatelli connectors are shorter than the OEM. Once installed, the coil packs do not seem to stick up as far as with the OEM connectors.
Inspect the coil cover gasket ensuring it is fully in place on the coil cover before replacing onto the cam covers.
It may be a good idea to ensure the bolt holes of the coil covers line up with the cam cover bolt holes before resting in place. (Worked for me).
Tighten coil covers appropriately.
I truly hope this helps everyone that has either purchased these connectors, or are thinking about purchasing them. Previous installs may have received some negative feedback. But I can assure you, this is quite simple for anyone to do themselves.
Best,
Mike.