Welcome Sarah! I feel your pain, or at least am sharing a similar experience. My company is in the process of going from Vantage 4.00.902 up to present day Epicor 9.05. It's been quite the process! But our live launch date is slated for the first week of February, so there's an end in sight.
If you have any questions or get stuck on anything, I'll be glad to offer you a hand.
-ben