Good in Theory

It is amazing.  I can have a goal, a strong desire or an aim.  Or as they say a “vision statement.”  I can plan everything out and say, “this should work.”
But to me there is a but and it is a big but.  I need to do it.  I need to set out on the path of the unknown.  I may think I know.  I may have done everything.  A plus B should equal C according to my planning.  
Yet I need to do it.  Aims, goals, desires are one thing.  It is necessary and good to have them.  Yet as they say the proof of the pudding is in the eating.
There are those who theorize about things.  They become experts in the way things should unfold.  There is teaching and conferences on difficulties and solutions.  Yet in my mind a true expert is someone who does not neglect the theory but who practices it an makes it work.
One thing I am very much against is attempting something and not seeing it work and maintaining the same methodology. I reckon it is true what they say that it is silly to do something the same way and expect different results.  Not always is theory a neat fit.  Sometimes there is a tweaking required.  Sometimes a way of doing things may be well meant, and work on the drawing board, but where the rubber meets the road it is necessary to change things up a bit.
The important thing to me is not the theory but the result.  I totally believe in theory, but I do not see it as the master.  I see it as the servant of the practical.  I will totally immerse myself in the study of the reasons behind why something should happen.  But in my mind there are times something is like 95% of the way to go, and there is a 5% that needs adjustment.
So often someone like a mechanic has everything in place (like a motor) and the consensus is this should work.  Yet it does not.  Often there is one thing that is not right that prevents the rest of the thing working.  It is getting that thing working as it should that enables the whole thing to do what it was designed to do.
I feel it is the same with a goal I may pursue.  Most may be right but still it is not achieving the aims I have.  I do not keep on with something that does not work.  I find out why it does not work and make the necessary changes.
Theory is great but only doing produces results.