Prior to commencing your project your business needs to have very clearly documented objectives and plans in place as to how these objectives will be achieved.
Good project planning can pre-empt issues and avoid pitfalls. Ultimately it will save time and stress on you and your business and lead to a better outcome.
Having attention to the following areas in your planning is a good start:
GBD will develop this plan with you and help understand your business case and returns for investing in the changes.