It is possible. Not easily achievable, though.<br />
We are humans, remember ?<br />
Not a very "harmonious" bunch.
Love into the present moment.
If this isn't a Zen question(it must be) then the question should more resonably be how can I find harmony? For me harnony is simply sitting on a beach and looking at the waves roll and crest then turn to foam and receed back to the sea. A distant storm approaching. moonlight on a dark pond a frog jumps ...the sound of water.
for me harmony is being content with my place in the greater scheme of things. yes, it's completely possible to live in harmony, but that also includes knowing that sometimes life will be difficult. always know the hard times will pass. life is a series of lessons learned from its ups and downs.
having everything I need and some of what I want. not going without and being content and happy with people and my environment.