You don't _need_ a lawyer, but I'd at least hire one for an hour to review such a letter. If the case proceeds, that counterclaim will almost certainly be ente

You don't _need_ a lawyer, but I'd at least hire one for an hour to review such a letter. If the case proceeds, that counterclaim will almost certainly be entered into evidence, and you'd want someone with more background and knowledge to make sure you're saying the right things.