You can do it if you want it but with the Beatles that's a lot of work because they usually use a lot of instruments like piano, mellotron, flutes and orchestras and stuff like that( I mean a day in the life has like 150 violins and 3 pianos in it )
A trick that worked for me when trying to dampen the low E & A string with your thumb when playing the D Chord, is just letting your thumb relax. When I tensed up I actually fretted a note on the E string, I recommend loosely letting it hover over the strings. Take this with a grain of salt though, hope it helps!
holy crap I will definitely going to be doing these chords for a couple weeks before moving on haha. Lots of practice and memorizing to do! its hard to get my fingers to swap between the chords fast enough
On the D major chord, I find it easier to fret the third string with my second finger instead of first. and the first string with my first finger. Is this going to mess something up in the future, or is it just recommendation. I don't want to build the muscle memory and hit a snag in the future because I do it this way.
It's possible to slow down YouTube videos and you can loop them or parts of them with an app called YouTube Looper.
I learned it from fellow students. Should help with Transcribing and practice in general.