Non runner to Marathon Runner at 55?! The real truth of how tough it is!

On April the 30th I entered the ballot for the London marathon in order to support a friend who has stage 4 breast cancer. She's planning to run it too so I thought, If she can do it, so can I. I have launched straight into training, because, being slap bang in mid-life , being a non runner, I have to give myself the best chance! Im only 6 proper training runs in , following the London Marathon training guide that promises readiness in 16 weeks!! REALLY?? There is small improvement from 3 weeks ago when I started and in this video's musings I realised that I must stick to the plan and not decide that I know best! I don't! never have done, never will do! I have done more than the plan states in the last 2 runs, to push myself harder, but when I do that, I usually fail, I get injured, get disheartened and give up. NOT THIS TIME!!