The internal reviews, any client consent, and the availability of the supervisors who must confirm the examples. These sit ahead of drafting and are outside the adviser's control, so they belong at the front of the plan rather than being discovered halfway through the work.
Put the slowest approval first
Ask each approver how long their review normally takes and schedule from the longest. Where a client consent may never arrive, prepare a version of the account that does not depend on it. Keep the distinction between an approved petition, a visa where one is required, admission, and the lawful start of work in view, since a file can be ready while authorisation is not yet in place.
Put the slowest approval at the front of the plan and schedule everything else behind it. Ask each approver how long their review normally takes, then add the delay that holidays and handovers create. Where a client consent may never arrive, prepare a version of the account that does not depend on it rather than waiting and discovering at the end that no fallback exists.
Keep the distinction between an approved petition, a visa where one is required, admission, and the lawful start of work clearly in view, since a file can be complete while authorisation is not yet in place. Communicate to the receiving team only the steps that have actually happened, which prevents two announced start dates.