I'll answer the best i can @AlwaysMyself
I really enjoyed the course, and developed a bit of a passion for peer work, so if you think you would like it, I fully encourage you to. It's a relatively new position so there's a lot of opportunity.
I did mine online here in Adelaide. We still did in-person study for some things and assessments, mainly because of all the role-plays. As long as the place in a proper RTO (Registered Training Organisation) you'll get a proper qualified certificate, so that would be the main thing to look for. Also having an idea of where you might do the 80 hours work placement. But they may sort that for you. As for fees, we have a pretty generous subsidy here in SA so it only cost me about $500 with a concession.
80 hours seems like a lot, but i did mine over 5 weeks with 2 days per week. But i'm sure you'd be able to negotiate with the organisation if you needed a bit more flexibility. From what i've seen, most organisations are very flexible with peer workers, as they will have lived experience and so often still have their own mental health to be mindful of, so they seem to allow for more flexibility and should have peer supervision as part of any peer work role.
Like I said, most places acknowledge that peer workers have that lived experience and offer a lot of support in the roles. Whether that be workload, mentoring, and peer supervision for feedback, improvement, and debriefing. We did have some peer workers speak to our class and they said their employers were very good at making sure they didn't get overwhelmed and worked with them to make sure and didn't go beyond their limits as far as stress went. You're also taught to take self-care seriously so that's a big part of the course.
I hope that answers some of your questions. I'm happy to give any more information if you would like any.