It's under control; I'll let you know if I need anything.

Meaning

I'm managing it; I'll ask if I need help.

Examples

• John: Is everything alright with the project?
• Alice: Yes, <b>It's under control; I'll let you know if I need anything.</b>
• John: Okay, good to hear. Let me know if there's anything I can do to help.
• Alice: Thanks! I appreciate that. I'll definitely reach out if I need assistance. For now, <b>It's under control; I'll let you know if I need anything.</b>