I'm a survivor of 5 years since my diagnoses, my biggest 'stress less advice' is, give yourself permission to have down time. I reorganised my life to have 1 week off after my chemo, and then got back into routine for the next two weeks before the next cycle.
It showed my family that life could keep going on and helped my teenage children cope better as they saw their mum keep going.
It is a "journey" make sure you understand everything, ask lots of questions and find a doctor/surgeon that you can build a relationship with because there's a lot of medical appointments.
Take up any offers that friends and family make.
Good luck, look after yourself, emotionally and physically, no one has your best interests at heart as much as yourself :-)