Just fitted mine this morning ..... although I didn't need rim tape on my wheels.
Went much as the video suggested - although when not using rim tape, but using push in valves, you don't need to drill out the internal rim valve hole as per their video.
having put tyres on and wet them around - you tap them with your palm, as on the video - which gets them evenly set and then when inflating with a track pump (floor standing hand pump) give the first few pumps pretty quickly (no valve centre in) to ensure they inflate and the beads pop in to place. Then remove pump, insert sealant through the valve (if you have the syringe) and then put valve centre in and re-inflate.
Then go through the process of shaking and lying flat, as per the video.
He does it with the wheel at 90 degrees to the floor, when shaking, but I found it worked better on my second wheel, when holding the wheel at about 45 degrees to do the shaking and then lying it down on the side closer to the floor for a few minutes before doing the other side.
Hope it goes well for you.....!
Job Done !