My 2 cents, since nobody else has said anything:
As far as I know, unless the damage is clearly evident, you'll have to take some measurements. Many people aren't comfortable with this process/don't have the tools, so they let a machine shop take care of it.
Here is the info you will need:
Personally, I have no idea how to measure bend and twist for a connecting rod; I think it requires some sort of alignment device.
Maybe Dialcaliper will speak up. He usually has something valuable to say in matters like these.