Re: Letting go of thinking through techniques
OK, I've only been doing it a few years, so take my comments for what they're worth, but IMHO, I would say practice a given technique or movement as correctly as you can as many times as it takes until your body remembers what to do next without having to consciously think it through. Then gradually you can start adding it to jiuwaza and types of different drills where you try to keep moving and not stop to think as much (while on the side continuing to do slower more detail-oriented and thinking oriented practice to keep improving it and ironing out the bugs). I.e., personally I can't imagine trying to 'not think' when learning new techniques, to me that sounds like a sure way to not really learn to do the technique!
To me personally, 'not thinking so much' has always been the _result_ of a lots of very thoughtful practice with attention to detail, not a replacement for it.