Reviving my galant

looks like my galant is running on its last leg. I'm hoping to see if it can be recovered .. :D

The engine rocks forward and backward when i shift from park to drive or reserve. On googling, i think it might be the engine mounts. Please could someone advice on how-to do this. I was not able to find any tutorials on this. Is it possible to replace the mounts by a not-so mechanic guy (me).


The second issue i see is that the bracket behind the plenum (copper looking thing) is loose and not in the hole holding the plenum. Is it ok or that's a major problem.

The third is I am tired of getting the rust of the radiator. It's a new radiator around 10 months old, the previous radiator was really rusted, so replaced it with a new one, even changed the hoses. But now the rust has come back. I guess the part which the upper hose connects to might also be rusted inside. Not sure what else i can do now.. please advise.