My suggestion to you is to focus on isolating that specific chord change. Don't worry about playing the rest of the song just yet...
Practice this chord change in stages:
1. Rest your fingers on the first chord, without pressing down on the strings. Without strumming or anything, focus on very slowly moving your hand away from the strings (maybe 2 centimeters) and shifting down to the next chord. Practice this transition back and forth, never pressing very hard on the strings at all! Gradually increase the speed until you've gotten to the desired amount... (make sure your fingers are landing at THE SAME TIME!!! not one after the other.)
2. Now, once you can do that well, practice lightly strumming each time you change chords, but still without applying any pressure on the strings more than how much you would a feather or a breast.
3. Then start pressing down harder on the strings, and you can strum along if you feel comfortable. You will start to see significant improvement here. All you need to do is increase the speed to the desired amount..
That should solve your problem. You can do that with ANY chord transition at any time. The most important thing is this: Do NOT start playing the song from the beginning again if you mess up. Find the spot where you've made a mistake, and practice that piece in isolation. Then slowly add a few notes before and after that point, and gradually "knead" your way to playing the whole song again.
It's like spreading pizza dough. You don't keep spreading the stuff you've already spread. You just work with the pieces that are clumping and aren't complete!
Matteo Miller-Nicolato
Free Progressive Metal-Jazz-Punk Fusion Music
www.matteomillernicolato.com/Music.htmlSan Diego School of Guitar
Free Guitar Playing Instructional Resources
www.guitarlessonsinsandiego.com/Resources.html