I don't usually need to be encouraged to self-analyse. I try not to do it obsessively, or excessively, but it's something I'm normally more likely to need to be forcibly prevented from doing than encouraged to do more of :-)

I do think the subconscious has no reasoning ability of its own; it would disturb me greatly to think that there were two independent reasoning engines in my brain. But I don't think it's unconnected to me-the-thinking-being. My view of the subconscious is that it sort of feeds off my own reason. It's not an independent entity which sees the same things I do and forms its own separate analysis; it will sometimes respond directly to sensory impulses (looking round at a loud noise, for example, is something I'm often aware of having done before I even consciously hear the noise) but just as often it will wait for my conscious analysis of a situation and respond to high-level concepts present in that analysis. This multi-level input makes it ideally placed to implement a wide range of habits, instincts and reflexes, ranging from direct response to raw sensory data (jerk hand away from hot thing) through higher-level responses to the interpretation of sensory data (feel pleased when you see someone you love, or notice when someone says your name) to the almost entirely abstract and conceptual (reflexively feel suspicious of someone's motives when they suggest you do something that would be in their own interest).

With that model, I don't think the subconscious requires any motivation beyond recognising patterns, reinforcing them when they occur again, and becoming able to respond to them automatically. You've done some juggling, so you've experienced this at a physical level - you repeat an action a lot of times, and at some point you stop having to think about it consciously every time because your right brain / subconscious / reflex system has taken over dealing with the mechanics and left your conscious mind free to handle other things. Most of the subconsciously driven mental phenomena I experience can be entirely adequately explained by the same sort of thing at other levels - my subconscious has noticed me responding in a particular way to particular (sensory, interpretive or abstract) stimuli, and has taken over the management of that response so that my conscious mind doesn't have to make the effort every time.

This ties in directly to my previous self-analytic journal entry, where I talk about the highly developed programming intuition I (used to) have: in this, the "habits" being formed are responses to particular patterns of abstract programmingy sorts of concepts, but the principle is the same.

I'm sure there's some reading of intent involved as well - I'm more likely to make a habit of a particular reaction to a situation if I feel satisfied or happy about that reaction the first few times I make it. This is why a juggler develops the reflex to catch juggling balls rather than the (initially) much more common reaction to the same stimuli of flailing randomly and dropping them :-) But I don't usually feel as if the subconscious has its own intent; it feels much more like a mindless pattern-recognition engine responding to my intent.