Face Blur for 5-Min Video

I have a five-minute clip that I’d like to share on my social channels, but the customer’s face is visible from start to finish. All I need is a clean, heavy blur that renders the face completely unrecognisable while leaving everything else—audio, colour, timing—exactly as it is... (Budget: £10 - £20 GBP, Jobs: Adobe Premiere Pro, After Effects, DaVinci Resolve, Final Cut Pro, Video Editing, Video Post-editing, Video Production, Video Services)