1. If you are happy with the balance at YE in Cashbook, then as long as you have a good backup, you could perform the YE function.
Ensure you have:
- Performed all Period End functions (including any "Clear reconciled transactions" - if next month transactions are found, they can be activated at this time & the current Cashbook will now include these transactions.)
- Posted all batches.
- Posted and cleared posting journals.
- Printed and cleared the Tax Analysis.
- Printed and cleared the batch status
report and backup you data.
(Note that the batch number will be reset to 1.)

The YE Process will take the end balance of your Cashbook and transfer it to your (new) current month as the new starting balance.

2. Yes, you must edit the Fiscal dates in Cashbook. No, the integration does not take care of that.

Hope this helps
Regards,