I grid to keep my place on my chart and mark an X over that 10x10 grid square when one is complete. I dont generally highlight or color as I go though. The exception is if I find I made a mistake somewhere I will use an erasable highlighter to remind me to go fix it later and once the mistake is fixed I can erase the highlighter.
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Yo me hago una copia, le marco con rotulador una rejilla de 20 x20 he igual en la tela con rotulador de agua. Con la de 10x10 me agobia con una tela de cout pequeño y marco los patrones con lapices de colores, siempre el mismo símbolo con el mismo color. Quizás pierda mas tiempo pero tengo menos herrores
Always make a copy of your pattern! It would be a shame to destroy (to dirt or sth like that). I paint over crosses Ive already made with pencil. Its more clearly (to me) which part is done. When grid isnt very visible - bold it (better with red or other vivid colour).