Using the emphatic suffix '-sa' would sound more natural - 'do scuabsa' & 'mo scuabsa'.
What do the first and second "e" mean, respectively?
The first é is a subpredicate, present to separate the definite predicate from An. The second é is the sentence’s subject, “it”.
Would you be able to leave out the second é like in the sentence "Is é an fear is cáiliúla é"?
I guess it's the "it" in the English translation.
Is it okay to say: "An é do scuab nó mo scuab?"
No - for a robust understanding of why, read (and bookmark) the post by @heathermagoo at