Wait, you didn't shake it for a whole week?

Wait, are you talking about a full electrical panel upgrade or just swapping a breaker? Because a panel upgrade is a huge job that needs a permit and an inspection, you can't really rush that part. But I've seen people try to DIY a new breaker for an AC unit or something because they're sweating in the heat and just want it fixed now. That's where the real danger is, trying to skip the inspection step to get the power back on faster.