Fish Tank air pump filter change? READ! please answer?

How do I change my 2.5 gallon tank. It's seem to be very hard to pick up and am confused. Am i suppose to bring a bucket next to it and poor it in the bucket and keep on doing it to get rid of all of the water and bacterial. And what about the gravel? there were hard to put back in the tank once you take them out all wet. Please answer my question thank you.
 
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