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Just try to play a game every day. It's disheartening at the beginning, but with every game you'll play longer and better. At the end of a game, it is perhaps the most difficult: one has forgotten the place of a piece (or that a piece is still in play), pieces are distant from each other, and one has to focus deeply and to "see" the board to be fully aware of their places.

With time, you will remain aware of a bigger part of the board easily -- pawn structure, place of pieces. You will forget less and less moves. Sometimes, you will have to replay the game in your head to remember the place of a piece, but it will become less and less often. Just trust yourself.

And don't force yourself. At first, in this game, I was with my eyes closed next to the PC, but then I went to smoke, then have a bite to eat, I thought about my position while drinking a coffee without full "vision". So, rest between moves when you can. Playing blindfold is a combination of vision and logic.

All serious players incorporate this type of training into their routine. Korchnoi read games in bulletins, Spassky played a handicap blindfold match against eight opponents before meeting Petrosian, etc. This considerably improves calculation and overall awareness.