My daughter how do I support

I have two daughters. My oldest is 17 AMAB. She is pretty early in her transition. Name. Pronouns. Growing out hair. Starting to wear skirts. And playing with makeup. I understand that my other daughter has been playing with makeup since 5 years old. So my oldest is so awkward and honestly terrible at makeup and dressing by comparison. How can I help and not insult her. And also not get too involved in her journey.