I do electrical service work for a living and have lost track of how many times I’ve gotten a “tickle”. Fortunately just 120v so far, I’m much more cautious with higher voltages. Often times it’s just not possible to troubleshoot with the power off.

A huge help for me is wearing proper PPE. I always wear these gloves. (See below)

Though not rated for electrical insulation, they have proven very effective (at least in my experience) against shocks at 120v, even the cloth part; and are cut resistant too. Still need to pay attention to where your elbows and such are at though.

When working on electrical systems, you should turn the power off whenever possible.

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