You're going to have to label stuff if you think its going to be a problem.
It looks worse than it really is, though. Once you get started, you'll see that it's pretty difficult to get things mixed up.
The hard part is making sure that everything gets connected back up.
If I'm unfamiliar with an engine, I'll use a roll of blue masking tape, and write where each vacuum line or electrical connector, gets connected and wrap it around the piece. Then as I'm reassembling, I remove the tape and it makes it easy to tell if something doesn't get reinstalled.
Just take your time and remember how it all comes apart and you'll do fine.