Loading historical Trial Balance (TB) balances

Hi, I'm new to the user group AND we're going live June 2019 on Dynamics 365. I have some questions. Does someone out there have experience loading historical financial balances ? We want to load monthly balances back to Jan 1, 2018 up to May 31, 2019. With June being the first live month in the D365 system. We only care to load TB balances in local & group currency. We plan to use the consolidation module for the May 2019 activity or May YTD activity to consolidate in parallel to our legacy systems and establish the "June 1 2019 opening balances. Appreciate some testimonials, lessons learned here. It might be easier to talk on a call my cell is 973-723-3137. Ask for Gene. Thanks.