Everybody needs it, but how do you go from this:
(don’t forget to click through to see the gore at full size)
To this:
Let me tell you. You need to be patient and vigilant. You need the patience of an owl, or some other very very patient animal. Wait for the building permit, wait for the building contractors, wait for materials, …
And if you’re not very careful, you will be fleeced. I was just researching those lovely sofa’s that I used in my SketchUp design. Le Corbusier‘s LC2 sofa’s. At Amazon 
The same goes with loans, raw materials, people, … So compare at least a few products. Don’t compare until you found the absolute cheapest. It will take you a very very long time, and the quality is probably going to suffer.