Thanks ladies, for your words of wisdom.

I know you're right and that, realistically, I need to focus more on my recovery - possibly taking two days if it's been a particularly hard week or I'm starting to get fatigued. It should be blatantly obvious, but it's difficult to stay subjective when you're also trying to increase your stamina and training - and taking two days off a week seems like precious training time wasted.
I know, I know - recovery is also important, but it's so easy to lose focus and perspective, I guess - which is why this board is great, always someone to give you a slap and set your right again!

I train with guys, mostly, who are stronger than me. That's good in one respect, as it keeps me pushing, but I also need to keep my own limitations in mind too, I suppose and - as you say - listen to my body.