Look up the timings and set an actual timer. Make sure your cookware is up to temperature before adding anything. Have enough experience to know how long everything else needs, so that you add your seafood at the right moment.

Scallops take very little time to cook, but a lot of seafood is more forgiving.

Also the danger of undercooking seafood is parasites rather than like salmonella. Good quality seafood is safe to eat raw - the stereotype of bad seafood giving you the shits is (as far as I understand) due to the ingredient itself being tainted.