Is Representing yourself in cases like this a wise idea?

https://www.businessinsider.com/capitol-riot-defendants-are-representing-themselves-2021-10 At least 5 Capitol riot defendants are representing themselves, including one who sent a billing schedule to the court

Several Capitol riot defendants are betting on themselves as they head to trial, despite a lack of legal expertise and warnings from judges, both implicit and explicit.

At least five people charged in relation to the January 6 Capitol attack have waived their right to a formally-trained attorney in favor of defending themselves, according to The Associated Press.
Is Representing yourself in cases like this a wise idea?
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