Hi KiwiGirl,
All the advice above is good. If it helps, by filing and serving an Address for Service, that is effectively an 'introduction letter' so you wont need to concern yourself too much about sending a formal letter for those purposes.
Legal fees can be expensive, but if you have difficulty with your case, InPerson Legal has SelfRep Assist, which is a legal service that allows clients to decide what parts of the case you'd like a lawyer to complete for you, and what parts you think you can do yourself. It's just an alternative to an all-or-nothing retainer with a lawyer. Book online with the below link for a free first consultation.
Hope that helps
