Render Bitmap tool
Adding extra lights makes rendering slower. If you add bluriness to a texture, it will make the rendering take longer as well. This has the effect of locking up your computer for 10 or 20 minutes at a time. This is not a great use of your time and it complicates decisions in regards to rendering. If you need help with textures, refer to the earlier workshop or kindle notes on textures.
The answer is to render small areas of your view with the Render Bitmap tool. When you render an area with this tool, the result is a bitmap. You can leave the bitmap where it is, or you can move it. Sometimes I have several images in the drawing as I try to sort out out the lighting, textures and lighting options.