On my daughter's '93 Civic I did couple years back I slowly carefully cut the patch to size and butt welded in. No overlap and no tape. I like to grind the tops of the tack welds as I go to help the additional tacks properly arc penetrate. You can warp panels very badly when grinding welds too if not careful.
I did another car after this one and used a small cut off wheel on Dremel tool. Much easier to see/control and was able to get the gap much tighter then when I did this car. Angle grinder sparks flying much heavier tool much harder for me to see/control. I am still learning.
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