This is a method that I have been using for a few years now. I used to work in a tire shop that changes tires on cars and light trucks. The machine that I used was a basic instrument for the job and what I do here simply does it on a basic principle. As shown in the video, you can also use a bumper plug or Hi Lift plug. The modern jack is what I had on hand. I usually use the back of a car to press the jack, but I have the Paper Weight Allis Chalmers 715 back hoe for this job. It is important to have a spacer for the opposite side of the rim to press against the car, otherwise the tire and rim will slip with the pressure of the jack and your work will not work well or at all. In the past, I used firewood, 2×4, another rim or whatever I had at hand. Here, I used the interlaced patio stone. I placed the side jack because, when I lift the jack, it needs room for the scissors part to expand. You will know in the first 15 seconds if you succeed by watching the separation of the heels. If no separation occurs, place the base of the plug closer to the rim and try again. Press the base of the plug into the ball area when you get a small separation if it does not want to operate the first time. Slow and steady operation will work.
Video credits to timlad5 YouTube channel