Explanation
The first step that the consultant should take when integrating Salesforce with the Student Information System (SIS) is to identify the integration layers, which are the components that define how data is exchanged between the systems, such as the data model, the data format, the data transport, and the data security. This will help the consultant understand the scope and complexity of the integration project and choose the appropriate tools and methods. Disabling Trigger Handler records and using the Data Import Wizard are steps that can be taken later in the project execution or testing phase, not initially. References:
https://trailhead.salesforce.com/en/content/learn/modules/education-cloud-basics/education-cloud-integrati
https://help.salesforce.com/s/articleView?id=sf.data_loader_disable_triggers_workflow.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.data_importer.htm&type=5