The crux of the issue is, of course, by how much do they lower your Fire Resistance with each hit. Considering the author, I'd estimate it to be 25%, which doesn't leave much room for error if your maximum Fire Resist is 127%. And even then, you can only take them one at a time, and of course you're dead if any one of them manages to get in two hits.
There's also the issue of whether or not they're required to hit you at all. I messed with an Improved Fire Giant once, and it seemed to get off two area-of-effect Lower Fire Resistances before it was even in melee range.
Easier way to beat them: Don't install them.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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