In reply to Removed Userjlouise:
Well, it's obvious that your boots don't fit as they should (which raises other questions about where you bought them, but that's for another thread) and yes, you'd be much better wearing something with good ankle support.
That said, in fair weather there's no obligation. Your chances of fair weather are slim. Not impossible, but it's the Ben. So, two strands of thought:
Can you get your boots to fit better than they do? Footbed lifters under the heel, for instance. A different lacing pattern. A cheaper solution than buying new boots that you can trial and get used to ahead of time. New boots that fit properly are the ultimate solution but that will cost money.
However, if you're confident in your balance and your ankle strength and, ideally, have or can borrow some walking poles, you might be ok. Might; I'm not saying you will. It's your judgement call and all responsibility for getting up and down safely rests with you, not some collection of random strangers from the internet. You might want to investigate some waterproof sock options; I don't use them but plenty of folk on here do and might advise you.
So it's your choice. You have options, including sacking the whole idea until you have better boot comfort and making a decent donation to mountain rescue should you knacker your ankle and have to be brought back down on a stretcher.
T.