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Yes, I feel your pain on this, literally. I’ve learned a few tricks for modifying. Honestly, getting the shape of the basic chords like C, G, and D (other basics) was easier than these power chords. I like his technique for teaching it, which I kinda figured out on my own about two years ago. It took me a solid year to get the basic shapes. I am trying to remember Tony’s mantra, “Progress over perfection.” Ultimately, improvement comes with practice, good feedback, and time. It’s nice to get feedback from everyone in the community, but it is not the same as having a good teacher actually having a close-up look at what is happening and then having a workaround. A good tip I learned about chords is to try not to think too much. Sit around with the TV on and just keep trying to make the shapes. But you need feedback, for example, his shape for the G chord is not the only way to make a G. Some ways of making the G are easier than others, which is what I learned. So there is trial and error. Keep plugging way. I made progress but it was slow is steady and I had the advantage of having guitarists take an up close look.
One other thing to consider, the size and shape of the guitar matter. I am starting to realize that I think a need a different guitar. So you might consider going to a guitar store and trying some out. Then shop. You can buy good ones, at a decent price, used. Good luck.