Work backward from the academic term's start date, allowing time for credential confirmation, contract finalization, and the filing or admission process itself. A fixed academic calendar leaves less flexibility than an employer who can adjust a start date freely.
Treat the term date as a hard deadline, not a target
Identify the term start date immediately and set intermediate deadlines for the contract, credentials, and any travel planning that need to happen before it. If those steps cannot realistically finish in time, raise that with the institution early rather than assuming the term date will simply move. A late start to a single-term assignment can consume a meaningful share of its total length.
Treat the term start date as fixed and everything else as movable, then place the intermediate deadlines behind it: contract executed, transcripts received, translation and any evaluation complete, travel arranged. Give each a date and an owner. The frequent failure is discovering in the final fortnight that the department has not countersigned the contract, which is the one document nothing else can proceed without.
A Canadian citizen may generally request TN admission at a port of entry, and an employer petition is an alternative with its own processing time; neither shortens document preparation. If the sequence cannot be met, raise it with the institution while a later term is still available rather than assuming the calendar will move.