Dear Friend,
" I AM going to say here one thing, Hanuman did not know his strength, the word RAMA bring the perfection" Let we forget whether he is monkey, god or human race, and Arjuna knows how to shoot, just he "concentrated" the eye of the bird nothing else.
In both the cases, the strength and the power(motivation), digesting/becoming the one, becoming the goal alone gave the perfection.
Do the work without slightest doubt, control the emotions, become the one of becoming the goal, put the passion into the work, see the result. You will certainly have achieved the 100%, the 1% will always remain a distance dream, sometimes the 1% deficiency will haunt us like a ghost. Coming to Shri Dinesh Divekar statement "Chalta Hai" attitude and taking the things granted lead us to imperfection, because of diversified culture, regional alienation we tend to go imperfection.