It'll heavily depend on table conditions. I tend to play TAG during the first several levels - however, if I see everyone else playing TAG as well, which isn't uncommon in live tourneys, I'll try some moves in late position to see how the table reacts. If I'm successful in stealing/taking pots in position, I'll shift to full LAG mode until someone can shut me down or the situation changes.
Unless you happen to be at a table of online players, I think you'll find the table conditions to be more tight and passive than you'd expect. Don't get too ****y about it (I see a lot of calling stations in live play, so be extremely careful when bluffing
- make sure villain will actually fold to a bluff) - but pick out spots where you can steal pots after the first couple of levels.
As above though, pay very close attention to players - find the fish, find the passive, decide on your opportunities, and attack - I think you'll find the skill level through the first 5 tables to be lower than you'd expect.
Be careful with the satty winners - some of them will be very good at aggressive play - but the satty winners may not have live experience, in which case they may have some huge obvious tells.