Remove Legitimate Credit Report Negatives

I need help getting two kinds of legitimate negatives—late payments and charge-offs—removed from my credit reports. My goal is straightforward: once the work is done, I want the updated reports from all three bureaus to show a clean record for the affected accounts... (Budget: $250 - $750 USD, Jobs: Account Management, Credit Repair, Financial Analysis, Financial Consulting, Financial Services Tax, Legal Consultation, Legal Writing, Research)