Wait until a replacement arrangement is real: an identified engaging party, agreed duties, and a defined period. Assembling documents around a prospect that has not been confirmed usually produces a second package that also has to be discarded.
Let a confirmed arrangement trigger the paperwork
The sequence that avoids repeat work is confirmation first, then a written duty description, then counsel review, then any application or admission attempt. If a new client is still in negotiation, gather only what belongs to the applicant personally in the meantime. Ask the engaging party for a realistic decision date so travel and household plans can be timed against something concrete.
Admission is granted for a period not exceeding three years, tied to the employment described, and extensions are possible. Only then choose the port of entry, ideally one with staff familiar with TN applications, and travel with the complete package. The case must show Canadian or Mexican citizenship, qualifying credentials, prearranged professional duties, and no prohibited self-employment. Keep documents from an earlier, abandoned arrangement archived separately rather than editing them into the next package, since a reused duty letter or reference can carry over details that no longer match the new engaging party. Check that any credential copy, license, or reference letter still reflects current information before it goes into a new file, since older versions can quietly go stale while a prospect was still being negotiated. Starting the new package from current documents rather than recycled ones reduces the chance of an inconsistency reaching the reviewer.