I started C25K a little over 12 years ago now.
And I started because
a) I had found myself at the obese end of the NHS BMI chart
b) a hormonal shift had either caused or coincided with being able to be a little more active than previously and I was well aware that having a disorder that compromises your ability to be active sadly doesn't come with a pass to avoid the risks that come from inactivity
c) brisk walking was proving unsustainable: it was uncomfortable, painful... and made me unwell afterwards
So, running... it was not easy but I have found that running can be pain relieving for me in a way that a walk may not be and I have stuck with it. On reflection the struggles I had with Week 1 in particular were not just about our forum favourite Running Too Fast but walking too fast.
I am getting to the tip though... recently I decided to try the Active 10 app walking pace checker and was startled to find that although what was a comfortable warm up walk pace for me doesn't produce the generally advertised signs of being fast enough to count as brisk walking... the app thought it was. So my tip is for beginner runners to check out their walking pace on the Active 10 app so their walk segments contribute to the success of their run segments rather than getting you puffed out.