I am not nitpicking here. Sometimes having a clear idea of what is going on will help you to play better.
The subconscious contains all those things that you can readily bring into consciousness but of which you are not currently aware. For instance, the way your socks feel right now is not something you were thinking about but as soon as I mention it you can "feel" your socks and bring this into awareness. That is using your subconscious to bring things into awareness that are needed for whatever eason.
The unconscious is believed to contain thoughts, emotional attachments, memories and attitudes of which you are not aware and things that in general you cannot bring into consciousness. For instance, you simply do not like people with red hair, you don't know why and there is little that you can do about it. (Before I offend anyone my first wife was a strawberry blond so I like red heads).
In general, you become aware of unconscious perceptions, thoughts and ideas by "feelings" that you get from time to time, like that feeling about the red head. The unconscious also has decided preferences such as liking to drink or gamble and it will often facilitate behaviors that will accomplish specific goals.
When playing pool you may get a feeling that you should take a shot that seems unlikely. If you go with the feeling you may be pleasantly surprised. On occassion I have observed my unconscious not like the route I planned to the next shot in 9-Ball. I went with the feeling and the cue ball traved less distance with the right position. I thought to myself, why didn't I see that.
In general, the unconscious is non-verbal (though there are ways to talk with it). It is highly perceptive and quite good at figuring out spacial problems. Probably one of the best ways to use the unconscious' abilities is to simply look at a table lay out (in 9-Ball) note where every ball is relative to the other balls and let your self feel the best solution. It is important to not talk to yourself. Verbalizations interrupt the unconscious processes to some extent.
Most of us call it intuition when we "see" a table layout or meet a person we just do or do not like. It is probably your unconscious at work because the unconscious is quite good at picking up subtle clues, signs and using its spacial awareness and control of your body to accomplish various tasks.