I'll burn that bridge when I get to it.

A combination of "I'll cross that bridge when I get to it." and the old addage, "don't burn your bridges". Meaning that you haven't yet arrived at a life obstacle, but you're sure you'll mess it up when you do.

"Hey man, did you figure out how to break the news to Kim that she's got herpes?"
"Nah, I'll burn that bridge when I get to it."

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