i need to replace my main bearing, the engine making knocking noises. i would like to know how much if i bring it to a shop. and are there a manual so i can do it by myself, also how hard if i decided that i would do it by myself. thanks you best

 

not worth fixing ...cheaper to get a used engine and drop it in. If you have main bearing failure or rod bearing failure something caused it like low oil pressure..sludge in engine..dont open that can of worms. Have it properly diagnosed first may not even be engine bearing.