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Your goal is to evenly coat the stained wood. You should be working in an area that is well illuminated with light. As you apply the polyurethane sealant look for any areas that appear dull. If an area appears dull then you either missed that area or didn't apply an adequate amount of polyurethane. Without delay you should do what is called "tipping off the finish," which is to run over the entire surface with long brushstrokes as soon as you completed coating the last area. You will brush from end to end and overlap your strokes. Because polyurethane dries quickly you will not want to poke along. Keep up a quick pace while working with the sealant. Get it applied and get it tipped off. While drying, do not tip the wood surface on its side. The surface needs to remain flat and upright to prevent runs.