Getting the job is an achievement that you can rightly be pleased about.

As for doing it, well just turn up and do as everyone else does - you will get used to it pretty quickly I expect. At least give it a go - you will be no worse off than you are now if you really find you cannot do it.

I agree it could be quite tiring at first, perhaps you could exercise a little to get ready, go for walks and so on. And be ready for early nights and perhaps some of your favourite meals until you get used to it.

Would it help to think of the new workmates you are going to meet, and learning or resuming your old skills not to mention pay day?