It's quite simple. You should exchange passwords on livejournal's private messenger. It takes the hassle out of using/getting an instant messenger system.
Once you log into the new account,
change the email immediately. Even if the person you exchanged with is reliable, it's extremely annoying for that other person to keep getting email updates on a journal name that's not even theirs anymore.
And that's it!
Remember,
journaltrades is not responsible for any lost journals. Please be careful while trading. I'd like to trust everyone I see on the internet but the reality is that we have to be careful.
Feel free to add some, I'd appreciate some feedback.