I already mentioned in the Table Selection article that you need to watch out against who you actually play and that you need to look for weaker player. However, if you are by some circumstances compelled to face strong and experienced poker players then this post will show you some tactics that you can use.
A very good way to confuse your opponents is to constantly vary your game. This means that if the other players start to believe that you bluff a lot, then you bluff lesser. And when the other guys start to think that you are very conservative, then you start playing more aggressive.
Like you can see from this example the main point is to irritate your opponents as much as possible, but when exactly is this strategy most efficient? I would say for No Limit poker with 5 or less players and also the stacks need to be large enough so you could successfully bluff at the turn or river. Once you are familiarize with this change of poker game style, your opponents will have serious trouble to find out when you are actually changing the pace! So my advice is to practice a lot.