Surprises are nice, but not when they involve underestimating the length of a couch! Of all the steps that go into fine-tuning a room’s design, perhaps none is more futile and yet likely to transpire than squinting to try and “see” if it’s all going to look right together. Envisioning what isn’t in front of you is a bit of a challenge, isn’t it? And of course it’s rarely preferable to wait and figure out a room layout when the pieces arrive (unless you enjoy dealing with customer service departments, in which case we can’t help you). You know the couch measurements, but what does that mean for the scale of that custom coffee table you’re having made or DIY-ing? How in the world will you nail the gallery wall without leaving a sea of nail holes in that fresh new paint? The following tips for perfecting measurements, patterns, and room layouts will save you a world of regret (and roughly 90 minutes on hold with customer care).