Different people will experience different emotions in those sorts of situations as they are presented with their oncoming end.
I think being at peace would be a lovely feeling, and I'm glad you got to experience that for yourself, to really gain new perspective.
I do think though that being able to come to terms and re-create that feeling with CTB, can be a bit difficult unless it is something deeply engrained within you.
Most people do not CTB because they feel at peace, but rather because they feel anything but at peace within themselves and their lives.
If it's a risk you are willing to take, I wish you well in whatever you decide. I do hope it is just as peaceful, if not more.
<3