Ideally when you get a real feel for the percentage of engagement of your clutch that you need to just turn the engine over and get it started, the gear selection will not be that important as long as it is not lower than the gear you need to use for acceleration.
In the scenario of steep hills where you might not want to bump in 5th and then go to 3rd or 4th, the choice may be different that bumping then changing gears immediately.
In no case when bump starting should you completely let the clutch out and the time it is semi engaged is very small.
When done properly, as Pale stated earlier a passenger in the car would not even feel the change is velocity of the car. That is much easier in the highest gear, but can be accomplished in the top 3 gears with some practice.
regards
Mech
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