Goosly
Veteran
but I'm not sure how to get it automatic in my memory so I can scramble a cube and be able to pick out the letters.
Well it won't be automatic from the first day. On the first solves, you'll be like: "blue-yellow, that belongs over here on my cube, so that's Q, R, S. It's S." And so on for every target. After a lot of solves, you'll maybe know the letter of half of the pieces when you see them. So then you do a lot of solves again, and you'll know 90% of the letters, but you think you know them all and you want to go faster, so you start making mistakes while memo'ing because you want to be fast. But that should go away after a lot of solves.
Every blinddsolver has to go through this process and all of them were able to, so don't worry and just practice