Zero Out Trial Balances?

We have been using Postbooks for everything except accounting for the last few months. This has made for one big mess.

I want to start using it for accounting start of fiscal year (July 1).

Would it make sense for me to "zero out" trial balances by countering all credits with an equal debit and vice versa on June 30th and then post a new G/L series bringing those zeroed out ending balances up to where they are at in Quickbooks for the beginning of the fiscal year?

Will my accounts then be in line if I make sure all accounts receivable and payable are entered correctly?

Please see "Before and After" pdfs for clarity.

Thanks!