Annette, I know it must seem a little overwhelming with the different scenarios swarms may present but once you catch a few, you'll see everything you've been anticipating will fall right in place.
Yes, there are little tricks that may help in this or that situation but when you get right down to it, its just some bees and a queen looking for a new home.
Think of a swarm as a package installation, cause that's really what you're dealing with, same basic thing.
I look forward to you catching you a nice one!
...JP