I do the httm. 100% successfully so far for nearly 3 years. My set up is two of each item. 10 gallon tanks, screen tops, heaters, pvc for hiding, thermometers, and using new air line tubing and air stones.
Between each transfer I sanitize with vinegar and everything air drys till next use in 72 hrs.
I use a big plastic colander to gently scoop the fish and move them…. No nets and no hands. It’s big enough I’m not chasing them around. I’m sure transfers are stressful for them but it doesn’t last more than a min or two at max and I’ve never seen them act differently afterwards.
I chose httm because I did not want to deal with copper and some other stuff that goes along with other methods.
I may be right or wrong but I follow it to a T. That means I start my process at a time I can work with every day. If a transfer is needed, I have to do it in 72 hrs. I can do a transfer earlier, but not later. If I miss it and get it done at 73 hrs that means I have to start over.
Quarantine is definitely a choice and many people dont do it. But when I started I followed that idea too of it being like rolling the dice. Then I lost 75% of all my fish and had to go fallow for 3 months. That blows.
Again I may be right or wrong but I follow the advice of the qt guy I’ve chosen to follow. So starfish, and one or two other inverts need no qt…. Snails and such do. So yes you could qt snails for 30 days or something in a fishless tank. I personally do not. I just want to insure the best I can that I do not introduce a fish into my display that could hurt the others.
Good luck!