Setting up AWS so you can try it via Amazon Bedrock API is a hassle, so I made a step-by-step guide: https://ndurner.github.io/amazon-nova . It's 14+ steps!
Your 14 steps appear to be 'create an IAM user'..?
Personally I am more familiar with directly using API keys or auth tokens than AWS's IAM users (which are more similar to what I'd call "service accounts").