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Making WP theme / plugin multii-lingual with out plugins

I’m new to theme and plugin development and am caught on the translation half. I learn one place that if you’re utilizing __(), and e() all through, you don’t want a plugin like WPML. Is it appropriate? Is era of the interpretation information (like .po information) for all of the goal languages a tricky job to do? Will I’ve to manually copy paste stuff from google translator and paste it in these information? Please excuse my inexperience and thanks or the persistence.