Yes, I put them in, feed them and let it go.
To be completely honest, you are getting far too caught up in the details. Keep your hands out of your tank, enjoy your fish, and let it happen. Also, don't try so hard to be perfect in your technique. It will eventually rob you of your enjoyment. You strive to be a knowledgeable and responsible fish owner, and that's awesome, but I'm going out on a limb here, you're probably thinking far too much about it. Most people's tanks cycle and they're not even aware of it. If you're worried about your fish, get a ton of plants, toss them in (they're bringing in everything (good and bad) anyway) and stay away from any new animal life for at least a month. At the end of the month, do a huge water change and get some more fish. You don't even need your ammonia and nitrite test kits if you wait long enough. Nature will take it's course regardless of what we do.
Also, don't be too obsessed with what is in fish store tanks. Even if you don't see it, it's there. Other than gill flukes and other parasites (and even sometimes with them too), all the nasty stuff is there all the time and in the water they come with. Sure it's good practice to discard bag water when you buy a fish, but don't kid yourself, a single drop on the body surface of the fish carries hundreds if not thousands of pathogenic particles. Keep your fish in good condition (well fed with variety and good water perimeters (stable temps
, dHG and dKH (and PH to some degree) and they won't get sick. Their immune systems keep them healthy, not a sterile environment (because there's no such thing). Even if you go to a fish store and see a tanks with no sign of trouble, those same tanks and a large portion of that water, was there a week before when there were issues. You can't stop the germs.
Relax and enjoy your hobby. No more about cycling!
It's all good!
Start a tank journal and post some pics