CRNA is school is not "hard". It is all encompassing. Your life revolves around it. It is not Metaphysics or Astrophysics.
You must be able to keep a heck of a lot of information in your noggin, and when it's time, have it flow out to your hands. In turn, your hands are skilled enough to allow them to carry out the mission your brain just assigned. The ability to retain, synthesize, and utilize information is paramount. A scientific mind is important. School will only give you applicational physics and chemistry. It will not start at science 101. That can be good or bad. You will talk about Venturi and Henry. But do you remember what their laws state? If you had a difficult time grasping or caring about the concepts, you may opt for some quality time with some refresher material. Although, deep down, these things should be interesting to you.
I can only speak for my BSN program. I received pretty much all A's, and feel it did literally nothing to prepare me for CRNA school. It did however better prepare me to undertake the extraneous MSN work.
Most anesthesia groups include you in their malpractice insurance
Don't be scared to try. It's probably not as bad as some have made it out to you. I have yet to find one CRNA who regreted their career.
Best of luck