Spot on the screen works very well from entry into descent until about 150 ft agl and about 250m away from landing zone. Only really need to decelerate when you are getting that close. Bear in mind this works very well for a 300 when your approach speed is 40 kt ground speed, imagine the R22 would be about the same.
Vortex ring is possible if you have a very steep approach in no wind with slow slow fwd speed( less than 20 kts) high rate of descent ( 500ft plus) and then take an armful of power. As Nick said for the truly ungifted - I think stupid would be better than ungifted, Nick is being too kind.