Without trying to give flying instruction over the internet here are some thoughts.
Assuming anti clockwise rotation when viewed from above and just talking about a stuck pedal, not loss of drive or components (like the tail rotor).
1. Its always a good idea to know how much MAP / Tq you were pulling in the hover.
2. The most left pedal you are likely to need throughout the whole flight is in the hover / during the transition at low speed and high power settings, so you are unlikely to have a failure with more left pedal than that applied unless have hydraulically boosted pedals and the servo runs away (its not impossible just unlikely).
3. Remember there are two speeds for any one power setting where the aircraft will fly level, so know your min ROD / max ROC speed. [Power Required Curve]
4. If there is no dramatic loss of components and you have something like say a mobile phone jammed in the pedals or control run from them then you have no rush to throw the helicopter at the floor.
5. As you slow down the fin and tail rotor will become less effective and for a given power setting the nose will want to swing to the right.
6. If you are raising the lever the nose will want to swing to the right.
7. Height is your friend, you can experiment and find out where helicopter is stable in yaw, by speeding up or slowing down and seeing were the ball is in the middle for a given power setting, this can be used to get to a place to land without flying there out of balance too far.
8. Speed is your friend until you need to land, hitting things at high speed hurts.
9. While at altitude you can see what happens if you slow down below min power required speed (see point 1) and then set hover power whilst slowing down at a constant altitude. You will see at what speed the helicopter wants to start rotating.
If stuck left this will give you an idea of a run on speed with no yaw, without needing to touch the throttle.
If stuck neutral you will likely need to roll off throttle somewhat (depends on type), not while at altitude but when you commit to landing.
If stuck right you normally have three options, autorotation as you will start spinning to the right at a higher speed on approach, a fast run on (perhaps to fast for the undercarriage), come in quick at low power, and flare quite harshly, closing the throttle as the helicopter starts to turn when you raise the lever.
You can also practice going around at low speed, while at altitude, I would suggest going for speed first before feeding in power to prevent an uncontrollable right yaw at low speed.
10. Land into wind or with the wind on your left.
11. Goto Tarmac not grass.
12. If you are in a twin alone you probably won't have the luxury or being able to tweak the throttles, if you get it lined up at a stable speed with no yaw, once you touchdown do not lower the lever very far if at all if you are on wheels it will try and turn and may rollover.
13. If you lose control in yaw at low speed and low altitude and start turning right, roll the throttle closed, it may not be pretty but trying to go around from an uncontrollable yaw will most likely end up with you increasing the yaw rate and having a nastier accident.
All types have there own little quirks and my pointers here are generic for most helicopters.
In my opinion stuck left is easiest but uncomfortable until back in the hover.
Do not try and teach yourself to do this, do it with an instructor who is comfortable doing it.
Do not take my word for it, I am merely giving you some food for thought, I would not want to try any of these actions for the first time in a genuine emergency.
Some tail rotor events can be found here, along with videos etc.
http://www.helicoptersafety.org/genericaccident.asp?keyword=Tail%20Rotor%20EventsMost flight manuals (I've just looked at a few emergency procedures sections) advise someting like enter autorotation if in the cruise or close the throttle if in the hover, so everything here may be considered bad advice, I offer it as food for thought only.
