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I agree that the best approach is probably to go on top of the whole mess with 3/8" drywall. Sometimes this may not be practical, though, because the additional wall thickness is not OK (for example, if there is a doorway in the wall). IN that case, you should remove the existing plaster and leave the lath, then go over it with 5/8" drywall (or whatever thickness fits). The only other alternative is to hire a plasterer...but he will not want to go over a base plaster that is not solid.
By the way, doing a "skim coat" of plaster is not a job for someone who does not have experience. It takes a bit of practice to get it flat, and the beginner will have a hard time getting it right, even if they do several coats.