Blending of Extensions...

Hey guys;

I''m getting great lengths hair extensiohns put in soon, and this is something I have always wanted to do since my natural hair is fine (but strong), and I can''t grow it long since it just kinda hangs there. Right now, my hair is probably chin-legnth. I HATE layers, and desire a long, one length style. Is this possible? Will the chin-length hair somehow be covered up to only show the long extensions or what? I have no idea how this works out, any help would be greatly appriciated!

Thanks;

-Tiff