Replace Text In Image

I have an image that already looks exactly the way I want—aside from one line of copy. All I need is for that existing text to be replaced with the new wording I will supply as soon as we start. Nothing... (Budget: £10 - £20 GBP, Jobs: Adobe Photoshop, Graphic Design, Illustrator, Image Consultation, Image Processing, Image Recognition, Photoshop, Photoshop Design)