Line up on final, extend flaps, reduce pwr, descend, land when ready. :-) DB6 describes this very well.
Landing on wet grass is almost like landing on ice, it is very slippery but no problem at all. I wouldn't recommend that you try landing in very tall grass, it can lead to a lot of troubles.
Another thing to consider is the animals that to eat the grass, sometimes they stand on the grass strip looking plain stupid.
Heli-Ice