It is important, even if you are not planning on touching anything inside of the panel, to be aware of the available fault current and appropriate ppe required. We had an incident where a cover was removed in order to take a measurement. There was a buildup of dust on top of the panel, it fell and created an arc blast. One person died (not an electrician, a supply rep) and the electrician was burned. These kinds of things can happen when you least expect it, so if you care about going home after work, don't skimp on the ppe.