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If I remember correctly, on the prelude it can be reached through the trunk. Lift the carpeting and/or mat to expose the access door.panel. Disconnect the negative side of the battery for safety purposes. Label the fuel lines with a piece of tape if you like. Disconnect them. Remove the nuts that hold the assembly in. It's usually best to put a mark on the pump and the tank, just in case you have any trouble aligning the new one in the tank. Carefully remove the pump assembly with a lifting and turning motion remembering what angle the pump faced. It's relatively quick and easy.
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Changing a timing belt is not a DIY job for the inexperienced, especially on an interference engine which the Prelude has. Do it incorrectly, and serious engine damage will occur when the engine is started. Take it to a professional for this repair. Also replace the water pump and service the cooling system at the same time. This will save you money on labor down the road, as most of the labor coast of replacing the pump will have already been done when replacing the cam belt. If the pump has already been replaced, then disregard this.
There isn't really an easy way, as the water pump is driven by the timing belt, requiring removal of the timing covers, timing belt etc to replace. This is definitely a job for a mechanic, or at least a skilled handyman with a lot of experience with timing belt replacement. The timing belt and tensioner will need to be replaced at the same time, but at least then you know that it will not need to done again for 100,000 kms (60,000 miles).