I realise that 'enlightenment' is one of the most overused words in the entire subject of spirituality. That said, here's my take on the subject:
The state of enlightenment, to me, seems to be when my mind stops trying to break down the universe into little bits...
In a normal state of mind, you see many "objects" in front of you... the mind automatically breaks the visual field up into different objects by looking for shapes and edges. Then it tries to fit a label to each shape or cluster of shapes... this is a pencil, this is my hand.
In a state of 'enlightenment', one diverts the mind from this activity, and focuses on the whole view... the input from all five senses. All recognition disappears, and information seems to come rushing in. The visual field seems to widen, your hearing becomes more acute, you may feel or smell things strongly. I always experience a sort of mental "buzz" at this stage...
That's the first step. Here's the second: After all other objects disappear, all that is left is the universe and you... but even this can be broken down. You let yourself simply experience, without the sub-thought of "I am experiencing"... the "me" then disappears, and only the feeling of consciousness is left. (And the mental buzz disappears with a 'pop', leaving just thought spinning in the void...)
After that, it's just a case of not trying to analyse what's happening... a very hard thing to do. Let me know if you've gotten further than this... 8^)