Stop in for a cup of coffee

So. Nissan in for repairs after safety. Had a buddy replace calipers, rotors and pads. Left rear wheel first. Incorrect brake pads, little nubs not allowing caliper to sit correct. Just ground nubs off. No grease on guide pins. Anti-sieze on caliper mounting bracket instead of locktite. Beat on rotor and bashed one wheel stud,and hit hub center causing it to not allow wheel to seat properly. Did not clean flaking corrosion off back of wheel mounting surface. And didnt replace dust plug for e-brake adjuster hole. Wheel nuts way overtorqued.
How much can a person screw up in one brake job??

Im not one to criticize a man’s work,but flipping burgers is probably beyond his ability…
Hope the front is better.