Q. What if one wants to pray Tahajjud but cannot find the motivation of praying it by itself but the added incentive of praying Tahajjud with Witr would?

A. The easiest method to perform witr is after the isha salaah. Not much motivation or incentive would be needed to do it after the Isha Salaat. Additionally motivation as well as an incentive would may be required to get up and perform the tahajud salah and thereafter perform the witr during the latter part of the night. To bind and make tahajjud a necessity would be wrong. To be challenged and pray tahajjud at a time when duas are most likely to be accepted is greatly rewarding.

Allah Certainly Knows Best.