Some considerations I wish our implementation consultants had taken us through:
• The "eliminate intercompany transactions" setting on an account is not a panacea, unless you are doing proper arms-length transactions (or advanced intercompany journals) EVERY time.
• You may want to consider having a "human checkable" basis for the consolidation rate, as using the auto-calculation caused problems with our auditors (they didn't like just believe in netsuite as an answer) - especially when you have multiple subsidiaries in the same "other" currency
• try and get consistency with your external reporting system, if you have one
• certain intercompany loans in our arrangement required special FCTR effects. We got around this using Foreign Currency Variance Posting Rules
It helps to have a consultant who's done this before, but if you read the suiteanswers per Karina's link it's ok to understand. I wish the suiteanswers examples were a bit more complex though