I did.
I kind of modified C25K because I knew that in previous running attempts, going too far too fast meant it hurt and I hated it and stopped.
This time I took it so incredibly slowly it was almost a farce. I did the following 3 times a week...
Week 1
Walk briskly for 3 mins, run for 15 seconds. Repeat 5x
Week 2
Walk briskly for 3 mins, run for 30 seconds. Repeat 5x
Week 3
Walk briskly for 3 mins, run for 45 seconds. Repeat 5x
Week 4
Walk briskly for 3 mins, run for 60 seconds. Repeat 5x
Week 5
Walk 2 mins 45 secs, run 60 sec. Repeat 5x
Week 6
Walk 2 mins 30 secs, run 60 sec. Repeat 5x
Week 7
Walk 2 mins 30 secs, run 75 sec. Repeat 5x
Week 8
Walk 2 mins 30 secs, run 90 sec. Repeat 4x
And so on. I basically just crept it up and up. Each week I either cut back on the walking time or increased the running time and cut down on the repeats any time the total session got near to 20mins.
I also gave myself to run as slowly as I wanted - speed was not a factor.
Plus I had permission to repeat a week anytime it felt hard.
It took so long to get to a mile of running and I was often tempted to skip ahead but I made myself follow the schedule.
I am so glad I did. It never hurt, my knees never were sore, it never felt like I was really pushing myself and I was able to get up to a mile whilst still really enjoying the run.