Probably bait but: Replacing a book cover is not a beginners task. A printer capable of doing book covers without looking like shit isn’t a household size item or household price and the printed result is different from the source image. Even if you scan the book at the highest resolution you will get the print pattern and not the pixels. Editing will be a shit show if there is a noticeable pattern in the print. Basically guaranteed to look like garbage if you don’t put an exorbitant amount of time in. Or if you have a book printing business but then the copyright lawyers will come for your first born.