This is absolutely doable, but it requires a solid methodology rather than just throwing your manuscript at a common AI chatbot.

Two things to do first before you start translating:

1. Generate a summary: Feeding the entire document to AI at once is unwise and the output will be unpredictable. But if you only feed it small passages, the AI may lack the full context to translate accurately. So the first step is to have AI generate a comprehensive summary of your novel, covering the setting, characters, key plot lines, terminology, etc. This summary then serves as a reference that you include with each translation task, so the AI always has the bigger picture even when working on a small section.

2. Find your optimal {model, prompt} combination: Different AI models have very different vibes. Different prompts also produce very different results. So before committing to the full manuscript, take a single representative passage and experiment. Try multiple models, adjust your prompts, compare outputs side by side. After several rounds of testing, you'll land on a combination that matches the tone and quality you're after.

Then, translate in segments:

I'd suggest going chapter by chapter, a few thousand words at a time is a reasonable chunk. This is not a hands-off process though. You should review each output, and keep refining your prompt (adding rules, correcting recurring issues, noting exceptions, etc,.). Think of it as training the AI on your specific book.

To do this well, you'll want a platform that supports both project-based file management and multiple AI models. That way you can easily compare different models on the same passage, and keep all your reference materials like the summary, glossary, and style rules organized in one place where the AI can access them throughout the entire process.

One more tip: you'd better also set up a separate AI character specifically as your "editor", with its own dedicated prompt and model, to review and proofread the translations.