I would suggest going to an old car club meeting and finding the guy in the club who does restorations. Then try to talk your way into helping him out at his shop. Soon he will be having you hang fenders and sand and prep etc...
That is how I started out.
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1931 Dodge Brothers DH6 business coupe wire wheels
1931 Dodge Brothers DH6 business coupe wood wheels (my 1st car)
1967 Dodge A100 compact pickup