It would be best to consult with an attorney
Sure its always best to ask an attorney but I think OP is trying to collect data points based on other peoples experiences.
I was at my cousin's side when he filed BK on a massive amount of cc debt, a consolidation loan, and two small medical collection. He had a massive amount of CC's he had been "robbing Peter to pay Paul" for years with BT offers and it all caught up with him after a short lay off and two rather minor trips to the ER.
4 months prior to his BK decision he had tried to consolidate his cc debt in a loan but I think he waited too long. That said, it did keep him in the good graces of several cc companies which aided in his swift rebuild process.
There were no creditors fighting him and no bumps in his BK. He stayed in his home and kept his paid off car. He didn't have to supply years worth of cc statements etc. I believe it was 3 month on the CC charges and there was one question about a waterheater purchase just prior to filing at HD but it was deemed an essential and not frivilous.
I on the other hand didn't file BK I walked away from my debt and now regret having done that because my rebuild has taken forever.
Unfortunately you can't only discharge credit card debt and not other debt. Make sure you meet income requirements to file Chapter 7
If you decide to file make sure not to pay any creditors/or even make payments to friends, use the atm or make cash advances etc or use the credit cards at least 90 days prior. Car/House exemptions are dependant on State Law as well as many other exemptions.
As for them fighting the discharge they only would if there was a jusifiable reason for them to file an adversary proceeding