So I followed a texturing tutorial by Blender Guru that shows you how to add bump-, specular- and displacement maps with nodes in cycles to make your texture look more realistic. I used my own texture to make things a bit more interesting for me but it ends up being way larger than I anticipated.
This is what it looks like:
This is the size that I'd like (but with a displacement map for added realism):
Now I know how to change the size of my image textures for the basic texture and the bump- and specular maps - via changing the values in the textures' mapping-section
but when it comes to the displacement map
there is no such mapping-section there, just an image mapping-section which isn't helpful regarding the size of the texture.
If anyone knows how to deal with this, I'd greatly appreciate your help.