If you're all fingers and thumbs, you are too excited or clumsy to do something properly that requires manual dexterity.
'All thumbs' is an alternative form of the idiom.
Beauty is in the eye of the beholder means that different people will find different things beautiful and that the differences of opinion don't matter greatly.
Similar to 'cutting edge' or 'leading edge', this implies a technology or process that is at the forefront or beyond current practices. However, because it is unproven, it is often dangerous to use (hence the 'bleeding').
When the blind are leading the blind, the people in charge of something don't know anything more than the people they are in charge of, when they should have greater knowledge.