Dont worry if its only about which gear at what scenario, Zest tells you exactly when to shift gears. It has gear shift indicators
But if you are not good with the process of changing gears(pressing the clutch sync), I would not recommend you to drive a new car. there is a bigger chance of clutch plates getting spoiled.
Are you planning to learn driving after buying the car?
Anyways, there is no difference if you buy sedan or hatchback. Any new engine will suffer if you learn driving from it.
Congrats Vivek on your decision
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I'm not sure about Amaze petrol, but Amaze diesel has a very noisy cabin.
And I believe, may be the TD vehicle of zest was in a bad shape.
Because even in my diesel, sometimes the engine noise is zero inside cabin.