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General Information:
Parallelism is common in Hebrew poetry. (See: rc://en/ta/man/translate/writing-poetry and rc://en/ta/man/translate/figs-parallelism)
song of ascents
Possible meanings are 1) "song people sang while going up to Jerusalem for a celebration" or 2) "song people sang while going up the steps into the temple" or 3) "song whose words are like steps." See how you translated this in Psalms 120:1
If Yahweh had not been on our side ... then they would have swallowed us up alive
This is a hypothetical statement that describes a result that did not happen, because Yahweh was actually on their side. AT: "Yahweh was on our side ... so they were not able to swallow us up alive" (See: rc://en/ta/man/translate/figs-hypo)
If Yahweh had not been on our side ... if it had not been Yahweh who was on our side
These two phrases mean the same thing. AT: "Without Yahweh's help ... without Yahweh's help" (See: rc://en/ta/man/translate/figs-parallelism)