I do them pretty much as Brad said.
The goal is to ravage them as little as possible.
They need some gentle persistent work to get them fitted to the inner pipe first.
Check the tapered snout of the inner, sometimes they're a bit scruffy and need to be smoothed out.
I'll put them over the inner pipe backwards:
|~~ inner ~~|
| |
| |
|___________ |
/\ /\
that makes it a bit easier to get it worked over the inner.
Once you've got that done, you can turn it around.
IIRC, the last one I did, I used two gaskets on each joint.