I was about to add the same.
I vend at UK shows and both my partner and I do the following when we get back from a show:
Any new animals get treated for mites and checked over then go into QT away from the main collection.
We shower and change clothes (you almost ALWAYS bring home mites when you spend all day at a show, sad but true, and I don't mean on your animals!)
We do not do any work with our collection for the rest of that day (ie no entry to the snake room and no feeding hatchlings.
Its far from perfect, but it's all we can do. We are home based hobbiest breeders, not blessed with two seperate facilities for QT and the main collection.
I think it is pretty obvious the OP underestimated entirely how seriously some keepers take it.
Couple all this with being very picky about who you buy from and what you buy from them, keeping the animals clean,well fed and watered and you protect yourself as best you can from the many bad things that can potentially harm your collection.