I think it will be different rather than a big step up. In community, pharmacists often have to make decisions on their own, as the sole responsible pharmacist. Patients come in with difficult problems, often when the surgery is shut and there is no one to ask for help. There is no support network, it all boils down to *you* - in some cases you will have good support staff, in other cases you won't. Clients with incomplete methadone prescriptions may very well turn up near closing time on Saturday afternoon and start kicking off.... or whatever
As far as I know, Band 6 is the basic grade hospital pharmacist and so you will not be expected to know everything about everything from day 1. There will be other pharmacists to ask for help when you need it. Although community pharmacy has had more of a clinical emphasis lately, we do not normally see patients blood results or anything like that. Also, the range of products used is quite different to hospital. Hospitals have a formulary and so the range is restricted, there are many products dispensed in community which will not be on the formularly. On the other hand, hospitals dispense a large range of injectables, cytotoxics and TPN which are rarely, if ever, seen in community pharmacy. You will have plenty of reference sources available if you need to make checks on dosages and other clinical issues.
I think it would be useful to look at the BNF every day. Each day, look at a different group of drugs which are used in hospital but not in the community.