There are measures you can take to not risk contamination. Like completely separate tools for QTs. Rinsing your hands with a white vinegar solution, then rinse your hands thoroughly with water and thoroughly dry them.
Its really not very difficult.
It also helps greatly having QT fish in a separate room. And I do that myself. I have a 20 gallon set up in my bedroom for that exact purpose. My 75 gallon is in the dining room and the betta tank is in the kitchen.
All my fish are now quarantined basically for life (no equipment, plants, fish or water is ever exchanged between tanks) as I learned my lesson when I introduced a particularly nasty strain of velvet into my fish room.
However, we are still human and mistakes are very easy to make when you are tired or in a hurry. I nearly got burned out of this hobby by that one stupid mistake so to me it is not personally worth the risk.
Plus I also now only buy my wilds from sellers such as Fishchick Aquatics, where the bettas are treated properly. I got frustrated with going to some of the fish stores near where I live and seeing sick and dead bettas time and time again. So I refuse to support them with my money.
Okay, so I'm thinking sometime this week getting 4-6 neon tetras (there one of my favorite fish) and a betta. I just wish I could get the snails out, putting some spinach in for a while worked but I think they became to smart. I think their evolving!