A good start point for fixed-pitch type failures was taught in the RAAF for a long time, works well for helicopters with twist grip throttles like the B205, 206, and we had twist-grip mod squirrels.
In a nutshell, set up on a long low final for a good run-on area and slow the aircraft in 10 kt increments, stabilising level and unaccelerated to see what the yaw angle's doing.
If yawed left (rotor anticlockwise from above helicopters), keep slowing down in increments until you get 40 to 50 deg. left yaw. or 20 kt. Maintain the speed you're at until over the landing area, then smoothly slow to the hover. If it turns left, reduce your Nr in small increments with beep or throttle (yaw will initially speed up, then slow as the tail rotor slows down and you pull a bit of pitch to stay in the hover).
When the yaw's stopped, put it smoothly on the ground.
If yawed right, slow to a minimum of 20 kt or maximum 20 deg right yaw. Maintain that speed until over the run-on area, then take a 'bite' of throttle to swing the nose straight and conduct a fastish taxiing auto. Use any further throttle to 'steer' (the nose will go in the direction that the bottom of the throttle goes).
In the yawing left in the hover case above, if it starts to go right, again take a bite of throttle and do a hovering auto.
This set of techniques works really well, and has the advantage of being a bit 'scientific' and repeatable, ie gives you some procedures and limits to hang your hat on.
For more catastrophic things like loss of tail rotor components etc, I'm all for setting up for a zero-speed auto as some people above are advocating.