Have hired people for the last 45 years my first thought used to be "would they worry my gran" answer "yes" then you are off to a bad start, I would have already formed an opinion, right or wrong from then on it is skewed against you.
My customer expects a level of turnout & professionalism that conforms to his\her expectations, if this is not met they tend to go elsewhere
I am also dyslexic both letters & numbers, the spell check a godsend might not get the words in the correct order but mostly the spelling is correct.