How play blind chess online?

Also, as of this week puzzles can also be played in blindfold mode: lichess.org/training

I presume you first view the puzzle. It would be insanely, preposterously difficult if you had to look only at the game notation.

#12 That's how I've been doing it. It's quite challenging.

You just look at the notation??? Even if the puzzle begins at move 54? "Quite challenging" is hardly an apt description. Einstein's general relativity would be "quite simple" in comparison.