Thanks for all the tips. I picked up a Kobalt helmet from Lowe's with autodarkening feature for about $100. Next I will look at respirators and clothing.
I'm debating riveting in a couple temporary patches so I can drive the car before/while I learn to weld and accrue all the equipment. I'm also starting to think this would not be a good beginner project because it's in the engine compartment.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)