I think the first thing to say is that FY1 jobs in A&E are pretty rare so you should be well supported. At the very least you should be discussing all your patients with a senior as you won't be expected to discharge patients independently. Have a low threshold for seeking help.
In terms of the actual work, I think it'll probably feel a bit intense for the first few weeks until you settle in. After a few weeks you'll have seen the majority of presentations and after a few months I think you'll have seen most of the common conditions.
I wrote a more detailed post here:
https://www.thestudentroom.co.uk/showpost.php?p=80876288&postcount=7240One thing I would add to that post is be extra careful about patients who are handed over to you as some doctors seem to be forever jinxed by the hospital gods to handover complex/difficult patients and it's easy to get caught out. Similarly, make sure you handover appropriate jobs and not things like referrals or discharge summaries as you're the one who's properly seen the patient.
If you admit patients, hold onto their record numbers and follow them up as they make their way through the hospital or outpatients - this is a good way of seeing what eventually happens to them as many times you won't arrive at a final diagnosis when you clerk them.
In terms of refreshing your knowledge - GeekyMedics is good for videos and quick recaps, so it might be worth taking some time to look through the neuro and MSK examinations before you change over. Search youtube for videos on ABCDE assessment e.g.
https://www.youtube.com/watch?v=hLuC0T7RsKI Final thing is to try and enjoy it (despite the tough rota) - I saw some interesting stuff when I did the job: TB, first presentation of sarcoidosis, encephalitis, erythema nodosum, some truly wacky malunions etc. Definitely getting nostalgic now
Hope that helps.