Like SimFreak said , watch your vertical velocity indicator CONSTANTLY. A good way to practise landing is to come in at a shallow angle , entering ground effect and then transitioning from a hover to a landing.
Now i will say i dont actually own the MI-8 , only the shark and the huey (soon to change) , but i spent quite alot of hours learning to land the damn huey and i dont think it can be THAT different.
Also remember that you can only enter vortex ring state if you are in a hover or a near-hover (is that a thing?) , not if you have high(ish) airspeed , i'd say about 30 to 40 knots should do. (50 to 70 kmph)
When i land the huey , i watch my intruments more then the actual ground. Is this the right way to do it , probably not , but it's good if you're learning.
Hope this helps
Edit : oh , and accuracy comes with experience. Learn to survive the landing before learning how to accurately land. Learning how to hover will also reduce the need to be able to land accurately.