Hi vjkarna58!
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I just looked at Caren's tute for you and just tried it myself. I always do a hands on before commenting.
[br]Are you playing it on an acoustic as Caren is or an electric?
First thing to check to see if its making your play harder is that your guitar's not causing you problems. If an acoustic, do you know what string gauge you have, are the strings relatively fresh, and is the neck relief set properly for as low an action as you can achieve with your config. Assuming it's a decent quality guitar, the height of the strings at the nut shouldn't be an issue at the second fret and the frets should be OK (level and undented with flat spoits/damaged).
If all of the above aren't right, it will render chord changes slower, harder, and old strings can do strange things to tone including induce buzz even when the action is fine.
If we assume all those things with your guitar are OK, your current problem as I perceive it seems to be expectation out of alignment with current skillset.
[br]First thing. Hand and finger stretches, then play something easier to warm up.
[br]Don't forget to use liftoff on the "and" timing technique to transition. Start playing the transition slowly, forming and reforming over and over until you can do it quasi instinctively and sound the chords cleanly. It might take you several sessions. Once you can, start out at 60BPM, then gradually start increasing the speed in increments mastering it at each speed step until you can eventually perform it at its tempo of 120BPM, which whilst certainly at the brisk end of Moderato rather than slow, isn't fast. Strangely, it didn't feel like 120BPM to me when playing it along with Caren, but I'll believe the notation.
Channel your energy into the solution rather than frustration. It is Technique, Time, Perseverence and Repetition until muscle memory rote. Little and often if frustration is an impediment. Get up and walk away once you feel frustrated, have a cup of tea, coffee, cold drink, then return to it. Rinse and repeat. Do that several times a day if needs must for as long as it takes. In the end, you'll wonder what it was you actually found so difficult?