In my meditation / practice I am using my best recollection of Hiram Bell's training when learning a new song. Play is slowly and correctly. Memorize a the first bar, play it accurately and go as slow as possible to keep it accurate. Visualize those finger / chord movements. Do it successfully without looking 3 times. Then add bar 2 or a couple more notes. Start from the beginning and go slowly learn it correctly. It takes more time and headache if you learn it wrong -- reinforce the correct tune / correct muscle memory. Close your eyes and feel it.
In Crazy Dawg's arrangement the measures aren't marked out so I use the phrases of the song as markers. Certain parts of the song have distinct finger movements in groups of 4 or 5 and it makes sense to remember these groupings. And perhaps the 2 notes prior and subsequent to piece it into your memory banks.
Here's another YT video of Roberta with words to sing along with...
Here's Crazy Dawg's link to the fingerstyle arrangement (Thank you Crazy Dawg, have I mentioned you enough in this post? Actually, I've never made contact with him. If you know him let him know about this post, perhaps he'll give me a Yo Howdy or a Guten Tag.)
Here's a CHORDIE arrangement in Dm. (I haven't fully studied it yet but I'm keeping it here as a record.)...