1.
Never work with live wires:
FIRST - Run all dc wire in conduit, lay dc wire in rack, land it in terminals in boxes and inverters, and crimp + and - plugs onto pv wire.
THEN - mount and connect panels.
In other words: you should never even touch a live wire, insulated or not.
Think of it this way: plugging in a PV panel to wiring is throwing the switch ON.
Why would you switch a circuit on, before you finished the wiring?
Always install in this order: Rack, Boxes, Conduit - Wire - Panels
2.
Remove GFDI fuse.
IF GFDI fuse exists, remove it - as soon as you un-box the inverter - and replace only after all work complete.
(The fuse itself creates a path to ground for accidental short circuits thru your body.......which is dangerous for personnel installing.)
Even better: use DC ungrounded inverters. Achieves same thing.
3.
I wear "Gorilla" gloves throughout the day. See if you like. They are rubber, come in very good size for me, like it was poured on my hand, help in gripping panels and i find them thin enough and comfortable enough that i don't keep removing them. They are - however - certainly not "electrical safety gloves". Sure there are thicker, 100% safe gloves, but i won't be wearing those all day. These..... i put on at 8 am and take off when i get in the van.
4. Never be in a hurry.