In reply to Maysie01:
Thanks so much everyone. I'd been absolutely sure that all replies would say "don't even attempt it if you're scared of heights"! But I feel greatly encouraged and more determined than ever to do it. I would only do it accompanied by a professional because of my fear of heights, but I have the determination already. I can't really practice scrambling without travelling quite a distance, we only have slight gradients down here in the New Forest! I'm okay with heights such as in Go-ape due to feeling safe with the ropes and I can climb the scramble nets as part of that but I realise that's baby fry compared to Crib Goch. Now that I think it'll happen, I'm excited! I just need to recruit a buddy to make paying for the professional affordable but wouldn't want to go higher than 1:2 because of my fear of heights.
Thanks, your answers have been helpful and encouraging. I've liked Jez' Facebook page for future use.