is it possible to easily create this effect on a mesh i modeled from a single vertex? I recently started work on a sword hilt to which I was later going to add a different blade and handle style to, however as i modeled this mesh flat and from a single vertex extruded to reduce the challenge to myself of connecting individual meshes together correctly i got the shape mostly correct however i cannot create the smoothed/curved effect that can be seen in the following image in the indicated areas that lead into the sharper edges. 

The arrows on the top image indicate the areas where the plastic or metal material curves into a sharp edge (the bottom arrow) and a flat side touching the blade (the top arrow)

the second image is an angle view of the mesh as it is currently, i have tested with marking shapr edges and smooth shading, and even the smooth modifier but they both resulted in a glitched out mesh that doesnt hold its shape at all even at sharp areas.
with further testing all day i found the only thing that will work even slightly is adding vertexes at angles as close as possible, no form of smoothing can be done however which is unfortunate but seems to be the best way. mainly the vertexes were needed to be scaled on the z axis just above the others with faces created from it in all the areas i needed it