It would be pointless to consider any 4th Step inventory at this time. The Steps build on each other, with successful completion of the preceeding Step inevitably funnelling one into the next Step.
The formal directions for Step 1 are to fully concede to one's innermost self that one is alcoholic. Therefore, it implies that knowing what it menas to be alcoholic is required. You can find out if you are alcoholic by laying down your own personal experience next the Dr.'s Opinion and the first 44 pages of the Big Book. What happens when you drink? Do you experience the phenomenon of craving as decribed in the BB? What happens when you don't drink?
If, when you honestly want to, you find you can not quit entirely, or, if when drinking, you have little control over the amount you take, you are probably alcoholic.
One of the hardest parts of using this definition is getting past the delusion of 'I didn't really want to quit', or 'I changed my mind.'
paraphrases from aabb1st