All home improvement projects have a completion curve.
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WHere X is the percent of completion, and Y is the difficulty required, in any project you do, there comes a level of diminishing returns. The last few percent of the project require a greater and greater level of difficulty, aproaching the infinite. The trick professionals use, because professionals have the same situation, is to conceal the last 2% under a piece of trim. In lanscaping, you plant a begonia. In auto repair, you cover the run with a pinstripe.