To answer all 2 of your questions, I honestly don’t think it’ll be too detrimental taking a little longer to complete the program IF your national board scores are good.
Nerves can really make a difference, I personally can tell you a story or 2 me screwing things up for myself because of nervousness during a practical AND even boards.
Think of it as a chance of an extra year of clinical practice to figure out how to handle nerves under high pressure so when you head to NC for part 3, you’ll be fully prepared then.
Every time you see a patient at school during clinic, treat it like a practical. Perfect your skill because it all comes down to passing boards honestly.
Good luck to you friend !