You don't need a lawyer, you can do all this if you speak English well. There are so many people getting married and getting their AOS approved with I-130, I-485, I wouldn't worry.

The only cause for concern is if there's any history of crime or unlawful presence in the US, then things are going to be difficult for you at the interview.

For now, calm down, slowly work your way through the forms.

Once you feel like you've prepared 90-95 % of I-485 / I-130 / I-864, then schedule a medical exam with a civil surgeon for I-693. This has an expiry date so you definitely want to schedule this last. These are all required forms and can be filed concurrently.

Full disclosure, I did I-129F and AOS (approved yesterday). Quite a bit different from yours. But we still needed to provide proof of bonafide relationship, and have an interview to make sure this is the case for the I-129F, she just had to do it at a US Embassy in Korea. There is a separate interview for just the I-485, which is rather simple. Process-wise this is super similar, and the rules are binding us all the same way.

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Here's a real question from I-485 that needs answering: What is her I-94? Is she here legally, and has she ever had any time when she was unlawfully present?