What I want to know is how does a "secessionist" micronation, after it is formed, gain diplomatic recognition from soverign nations. I prefer honesty, if it is at all possible, about how difficult such a task is. I'd also like to know what has been tried...and if it was successful or not.
I have heard that in Somalia, at one time, a group micro-nationalists had the approval of the authorities to start a project to build a micro-nation there, including the construction of a road. I do not remember whether the authorities in this case were in fact the legitimate internationally-recognized government of Somalia at the time or just a local warlord. I do not recall any new nation projects that have successfully gained official diplomatic recognition from another nation. I am aware of some ways to accomplish this goal that might work, at least in theory.
But first I must mention that, of course, small ethnic groups with long and rich histories, such as Jews, Greeks, Georgians, and Serbs, have successfully formed new nations within the past couple of centuries (i.e., modern times) from the remnants of once vast empires. Also, they have in many cases obtained successfully diplomatic recognition from a variety of nations (sometimes with the exception of a large number of nations that are their ideological enemies.) Unfortunately, with most of the nations that start from scratch, the historical claim to an area of land is not as strong, and cannot be used as a part of the case for obtaining diplomatic relations. If your micro-nation is Welsh, Breton, Tibet, or Basque themed, well, then maybe you have a better case than some other nations with no historical connections to any actual land, not to say it would be necessarily very easy.
One interesting idea I have heard mentioned for obtaining sovereignty is to establish an embassy for your nation in another established country. Then, according to international diplomatic tradition, the land on which the embassy sits and the buildings on it are considered to be your nation's sovereign territory.
Also, most of Africa and parts of Asia can be fairly corrupt; not to endorse the idea, but I have a feeling that certain "gifts" could sway officials in such areas to cast a more approving eye towards new nation projects seeking sovereignty.