I use a twist controller and stil stay the most dangerious helicopter pilot around.
I can take off by applying power :)
and the more power, the higher you go, see below.....
I cannot seem to keep the heli under control, I spin left and right :-X
Worse on different helicopters, the chopper wants to travel the same way as the blades. Gently feed in twist to the opposite direction, then twist back to the existing direction, practise this a few times and you`ll get out of the spin. So it spins left, you make it turn right by the rudder control to counteract the left spin forces. You`re introducing your own right spin forces which then act as a break to counteract the left hand spin. Always feed in any new throttle increase gradually rather than all at once, this will stop most spins from even starting in the first place.
I cannot get the heli to hover in the air
Throttle up gradually and steadily, nose down for forward and nose up to stop or even go in reverse, very gradule movements and you will either go forward, go in reverse or hover. Again this is easier with certain types of helicopter than others. Some even employ a hover control.
And upon landing I cannot put her down vertically, instead I come down like a A380 :o
Again, gradual throttle control, employ nose up/down technique to go forward, go reverse, hover until you land. Not all, but most choppers do not hover, they only appear to do so. Its a forward, back movement so they stay in virtually the same place. This is unless they employ a hover control, which is usually another jet. The hover motion is crucial to getting the chopper first to land, then land in the correct place.
After many attemps and many curses from air controll about my horrific heli skills I decided to give up on flying them

Each time you give in and go back, a bit more will stick in your mind. Do it in steps as follows, each step will help you in future steps....
You got take off
Try anti torque (torque is turning effort)-anti spin
Move forward
Move Reverse
Hover
Stop gong forward/reverse (counteract by the opposite direction same as in the anti spin-its like a balancing beam)
Land
Land in a specific area or as near as you can
I heartily suggest you get hold of the Chinook and the Appache (free) from Avsim, Simviation etc.... and practise with different types of helis. I find the Bell is a good one to start with as its less prone to spin than most.
Reider