Finally after procrastinating for a week or so, I did it, yay!
I was glad I'd joined this forum beforehand though, because a couple of times during the run part I felt it was too much (64 yrs old and not run for 40 years) but I remembered people saying just do it you'll be so proud, so I did, and I am. Slow jog, following Laura's podcast to the letter, had a glass of water and did some stretches and ate a banana on my triumphant return home (anyone would think I'd just run a marathon instead of shuffled 8 measley minutes in the local park!