Started C25k in January, as part of a major health push for 2020 after having my daughter last August.
I weighed myself on New Year's Day and was shocked. I'm 5'10" and well built (along with loving my food), so have been "heavy" my entire adult life, but seeing "15 st 6lbs" come up on the scales and then realising that put me in the obese BMI category sure did put a rocket up my arse.
I felt so shit after even 1 minute intervals of jogging that I couldn't believe I'd ever be able to run for 30 minutes, but I just took it one run at a time. Two of my friends had also decided to do the program alongside me, and we set up a WhatsApp group to encourage each other.
Not only did I manage to graduate, I caught the running bug in the process. Having also overhauled my diet, I now weigh just over 11 and a half stone, so a healthy BMI, and ran a half marathon distance a few weekends ago in 2 hours and 10 minutes. I can now run 10k in about 55 minutes, and would put my 5k time at about 26 minutes (it turns out i actually much prefer a long run, so I haven't really focused on a speedy 5k for a while)
So, I would say,
a) get "company"
b) trust in the program
b) accept there will be good runs, there will be bad runs, but it can be done. And then some!