"The mind of man plans his way, but the LORD directs his steps." Proverbs 16:9
Before we started carrying 8' timbers to the patio area, we thought it wise to determine the layout. Being the visual learner that I am, Lego blocks worked great for this. The longer we worked at putting these blocks together, the more we realized the layout was not that difficult. Most likely, the plan would change as we went along anyway.
(Even though my son is now 19 years old and no longer living at home, I have always kept his Lego blocks. They are such great toys allowing kids to be wildly creative!)