You need this addon for Blender to import and export SMD files

http://steamreview.org/BlenderSourceTools/

Do you have Crowbar to decompile MDL files and compile SMD files?
Do you also have blender (If you have another 3D model viewer then I don't what else to do)

Link to Crowbar: https://drive.google.com/file/d/0Bz8zS9qTrqHWWUVramFPbUdUemc/view
Download Blender from steam

What I can do:
-Porting existing models to Gmod
-Blender
-Re-textureing models
-Make props
-Make ragdolls
-weight painting (kinda)
-Model edit

Want to learn:
-Making faceposing and fingerposing
-Making playermodels
-Making maps
-Making custom models

I use crowbar to compile and decompile models