It sounds like you use this more when you have gotten to a point when you have done all that you can do regarding some situation. For whatever reason 'it will work itself out' to me seems more like...you COULD do more but are deciding not to. In all honesty I wish I could be more 'it will work itself out'. I usually even go beyond the whole 'it's out of my hands' point...and it ends up working against me! Uff.