Write SQL query to solve given problem: How frequently does the first-ever Scheduling Assistant get paid?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.PayFrequency FROM Employee AS T1 INNER JOIN EmployeePayHistory AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID WHERE T1.JobTitle = 'Scheduling Assistant' ORDER BY T1.HireDate LIMIT 1