well all of the parts were hard if you think that i almost didn't know anything about poly-manipulation...but finally found out many things...
the blade started somehow like this: curves->planar (poly)->then designed on the blade the line that bumps a little up..using poly-spilt and then just selected the faces of the line and translate it a little higher and it started looking like a blade..(of course i did a little more tweaking later..)
As for the white spots..it is 3d paint, airbrush.

É don't think polys are so great (maybe later in the project they seem better), i first use nurbs and then convert them to polys.