what kind of card makes sense to be graded?

hi, i m new on this board. i heared about PSA GRADING and searched for it in the net. then i found PSA, but now i have got a big question, when you hold some very nice cards in your hand. and you should grade them, then we would tend to give them 9 and 10, but what will PSA will say to these cards. how can you find out ok this cards must be graded with a 8 and thisone would be graded with a 4. are there any instructions from PSA how they grade their (ours) cards?
thank you for your replies
biber
thank you for your replies
biber
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Jery
thank you
biber
good luck
sincerely yours biber