To manage poor initial estimation in project budgets, consider the following best practices:

1. **Use Historical Data**: Leverage data from previous projects to inform your estimates. This can help provide a more realistic perspective on costs.
2. **Involve Stakeholders**: Engage team members and stakeholders with relevant experience in the estimation process. Their insights can help identify potential costs more accurately.
3. **Break Down Costs**: Use a Work Breakdown Structure (WBS) to break project tasks into smaller components, allowing for more detailed cost estimation.