To install SH3Cmd just run the executable and follow the instructions. Since you're using GWX 1.03 you need the Cfg files for GWX. Click on my signature or on the link under it to get them. The Cfg files are easy to install. Just copy them into the SH3Cmd folder and overwrite the original files. After that you're ready to play.
As far as the GWX Skins are concerned you need to use JSGME for that. This is how to do it:
1. Copy JSGME.exe into C\Program Files\SH3Cmd
2. Run JSGME.exe to create the MODS folder.
3. Extract the GWX Skin Pack into C\Program Files\SH3Cmd\MODS
4. Run JSGME and enable the Skin Pack
5. Lunch GWX via SH3Cmd and enjoy your game
The skin pack will not slow your PC. You will see longer loading times but the game speed (FPS) will not be affected.
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