Hi, Tash, well done on starting and even better on keeping going! You've had advice from the most valiant and most experienced runner of us all, Mick, so if you do what he says, you'll do fine!
And do you remember what he said? Take it slowly, make it enjoyable, don't rush....if you're exhausted and hurting, you probably ARE trying to do too much, too fast. We nearly all do it, and if we do, we pay for it. You can't rush it. The rest periods in between exercise are when your body actually build up so it can doa little more next time. If you're not taking those rests, you're actually setting yourself back.
I saw you were in the Netherlands---I am too, so if you email me through this thread maybe we can compare notes!
Take it easy, and remember you're doing this for the sheer pleasure, and you're in it for the long term. There's no hurry, you're doing fine! xxx