Helps a lot to learn the slender-to-slender, broad-to-broad rule -- slender happens high in the mouth, and is marked by the vowels i and e around consonants (palatized) Broad is low in the mouth, and is marked by the vowels a, o, u around consonants. And consonants will always have just slender vowels around them, or just broad. "Ise" is slender; "aba" is broad; "il" is slender. So Ise + aba + il. Consonants do different things when they're slender vs. when they're broad, and the unexpected stuff is mostly slender consonant combos. S becomes sh when it's slender, for instance.
So you'll never have the combo "isa" -- i is slender, a is broad.
And the other thing I do is ignore the pronunciation entirely, and just look for English words inside the Ghàidhlig ones: I sea bail. But be sure to remember the correct pronunciation if you do that!