Play single table SNG's!, that's one of the best places to get a feel for final tables that you can get for practice.
9 to 7 players=TAG 6 to 3 players loosen up a little, 4 to 3 players loosen up even more. Heads up is a "head game", very psycological.
Table image is so much more important at the final table, you have to set up plays and knock them down, be aggressive from 6 players left down to the final two. That's selectively agressive, smart aggressive, reading your opponents styles correctly and use their strengths and weakness's against them.
Aggression usually wins, that means raising with almost ANY two cards, if you hit the flop punish your opponents, when your weak "any2" hits the flop for two pair, top pair plus flush/straight draw PUSH.
Calling and folding isn't an option, betting and raiseing are the tools you need to "read" your opponent, you have to get a feel, "use the force", for your opponent, if he plays back at you does he usually have it? If yes = FOLD! If no go with your gut.
Fear is a KILLER, you almost have to play any 2 cards, call and re-raise with trash, depending on your image and how you've set up the final table, this may work for you or against you. Who's more aggressive you or your opponent, who's been getting luckier, who's been catching the flops? Or not catching them and betting the other off the pots? You absolutely have to be able to read what your image is to your opponent, and think what he's thinking your thinking he's thinking etc.
When two aggressive players are head to head and competing for table/bet control you'll often find yourself in a hand that you or he may have the best going in, to worst on the flop and best again on the turn and then get out drawn on the river. It goes both ways sometimes for you and sometimes against you.
I find most of the time, when you have a weak player head to head you can control the betting and win from just being aggressive and scaring them into folding most hands, then trap them on a great hand you didn't raise to bust them out and take first.
When your head to head with another experianced player and competing for control of the game, it's a luck fest, you either win or you lose that's just the way it goes. So when ever I get heads up with an experianced player and we're competing to control the game, I'll try to experiment if I get any ideas while playing, also a good tip for heads up against an experianced player is to play slow take lots of time with every hand and try not to go all-in with less than A/J. A/weak kicker heads up is strong but check for resistance, you can get out kicked even heads up. A/x is great for pushing weak players around but it will get you in trouble with an experianced player.
The best you can do though is to play SNG's, a LOT of SNG's you can learn a lot from those in how to build table image and develop 6/5/4/3/2 player reading skills. .