Grading has evolved somewhat, especially with the prevalence of Third Party Grading firms. The "old" grading style is not assigning numbers to the grade. So coins would be labelled as Good, Fine, Very Fine, Extra Fine, Almost Uncirculated, Uncirculated, Brilliant Uncirculated and Choice Brilliant Uncirculated. Split grades would be the better grade with the prefix 'About' assigned to the coin. So a VF-30 coin would be called "About EF"... Some dealers still grade their 'raw' coins this way, I grade my international coin stock (i.e., non-Canadian or American coins) this way as well.
The book DBM mentioned is probably one of the better ones. It is a skill that should get better with time, when you have seen lots of coins of various grades.
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