Retouching Skin in GIMP

When editing photos, one of the first things you'll want to do is "fix" the skin of your subjects. I've fumbled around with this for years. I use almost exclusively open source tools like GIMP for my work, which while extremely powerful, often lack most of those automatic tools and niceties present in paid products like Photoshop. So I'll share my method, which I adopted from this YouTube video.