Yes, there would be more errors than typing with a screen. But keep in mind that you can look at the keyboard, and that can help a lot. The hardest pat when typing without looking at the screen is correcting errors. I am typing this message looking at the keyboardd, not the screen, and occasionally I miss, but am not usre if I missed one or two keys, and so do not know how to backspace and correct it. Also, a coule times I gor half way into a sentence and wanted to go back a few words, and had no idea how to do it. Still, it would be good enough to provide usable notes.
NOTE: I am now looking at the screen. The part above was typed with my head leaning over the keyboard and looking almost straight down, and has not been edited. I could see some glow from the keyboard at the top of my vision from the bottom of the screen, but all of the text was in the top half, completely out of my vision.