Drywall repair looks like the simplest trade in the house until the paint dries. The mud is easy. The texture is not, and a mismatched texture is the thing that turns an otherwise good repair into a permanent reminder that something went wrong in that room.
Texture is a recipe with four variables: the mix consistency, the nozzle or knockdown tool, the spray pressure or hand pressure, and the timing before it gets flattened. Knockdown that gets knocked too early smears; too late and it stays sharp and sandy. Orange peel changes character with a small pressure adjustment. Two people using the same bucket on the same wall will produce noticeably different results.
Before any of that, the repair has to be structurally right. Cut back to solid board, back the opening so the patch does not flex, tape the joints properly rather than relying on filler alone, and feather the coats out much wider than feels necessary. A patch that is mudded eight inches wide will telegraph a shadow line no matter how well it is textured, because the plane change catches side light.
Then there is the reason the drywall failed in the first place. If it was water, the repair is worthless until the roof, the flashing, the gutter, or the supply line that soaked it is fixed. We check the cause before quoting the cosmetics, because coming back to redo a wall is a bad day for everyone.
Finally, prime the repair before painting. Fresh joint compound absorbs very differently than the aged paint around it, and a patch skipped past primer will flash a dull halo in daylight even when the texture is a perfect match. Prime, then paint corner to corner rather than spot-painting, and the repair genuinely disappears.