Import the .blend file into blender and export it as a .nif.
And, when I try to use NifSkope... When I first load my model and save it as a .NIF, I get this error: "Warnings were generated while reading the blocks. block 4 Tangents array size mismatch
block 4 Bitangents array size mismatch
block 6 Tangents array size mismatch
block 6 Bitangents array size mismatch"
And if I try to load it again, it just gives me this one: "failed to load block number 4 (NiTriShapeData) previous block was NiSourceTexture"
And I have absolutely no idea what this means or why... I really don't want to go to the trouble of trying to remake my model, it took me most of a day and it's the first thing I've ever actually made, so...