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I have welded in a heap of patch pannels made form galvanised sheet metal and never once have i experienced dramas. Because you are only doing small welds or tacks you aren't being exposed to enough of the toxin produced to give you any effects.
If the piece you were welding in formed part of the main structure of the car, like a firewall in a uni body car, you might go to the trouble of taking the gal of the metal as so it doesn't contaminate the weld, but for a simple patch, you will never notice any difference.
As for holding it in place, use a magnet if possible just to get the first tack on and then you can remove the magnet and do the other welds.
If the piece you were welding in formed part of the main structure of the car, like a firewall in a uni body car, you might go to the trouble of taking the gal of the metal as so it doesn't contaminate the weld, but for a simple patch, you will never notice any difference.
As for holding it in place, use a magnet if possible just to get the first tack on and then you can remove the magnet and do the other welds.
