Thanks to SketchUp Materials Library for these tips.
8 tips for scaling in SketchUp
“To use the Scale Tool, pre-select the object or objects you’d like to scale, then press (S) to activate the Scale Tool. …” here
A solution for low resolution textures
“Have you ever brought an image texture into SketchUp and notice that the resolution isn’t as crisp as it is in your image viewer?…” article & critical responses here (but beware of ‘spam’ posts)