Don't feel bad, I've been there on other projects. 
First, disconnect the battery ground.
Second, put the work clamp close to the area being welded on good clean metal. If the clamp moves around, it can arc and cause spikes.
Third, unplug the engine harness to body harness plug to isolate the alternator.
Fourth, unplug the CDI.
Some guys go to the effort of unplugging gauges. The most sensitive would be the tach and speedo.
Some guys get lucky and never have an issue, sometimes it'll fry a couple of things. On an old Chevy I fried a Mallory Unilite module and the alternator regulator.
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1986 911 Turbo
3.3L, K27HFS, Tial 46mm, TurboKraft Intercooler, 964 Cams, Monty Muffler, MS3Pro Evo, M&W Ignition, Zietronix WBO2 Data Logger, Wevo shifter, coupler and motor mounts.
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