A couple of things which will speed this process up.
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Open your automation panel and under settings make sure reveal parameter on write and show waveform data on tracks is enabled. This means that any parameter that is written will be revealed in automation lanes without having to search through and you can also see your waveform data underneath the automation.
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If you want to “draw” a quick volume change over the section you can use the line tool rather than the pencil tool which will create the 4 automation points.
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You can quickly use the info line to set automation data. When entering numbers you can either use enter for relative change or ctrl + enter for absolute change. This makes it very easy for example to rubber band some automation points and either adjust them relative to each other or set them all to a specific value.