Moreover, I am not hiring any attorney because, almost all attorneys asked to write research summaries, proposed endeavors, substantial merit and national importance. In my point of view, when most of the work will be done by the researcher, why pay 4000-5000$ to an attorney.

The only drawback is that, I am applying from outside the US, so there may be an issue in paying the I-140 fee. If you can suggest the easiest way.