What am I doing wrong, can someone point me in the right direction
Ask 100 CMDRs and likely get 100 answers but
I can tell you how I do it (wall o' text version):
When I enter the destination system I find the destination planet and head for it at full (100%) throttle. As I approach the planet I keep an eye on the countdown timer that accompanies my destination/target marker in the HUD. When that countdown to destination timer reaches 7 LS (seven light-seconds) I
immediately set my throttle to 75%.
I have a button specially bound for setting 75% throttle. 75% throttle is an "
auto-throttle" setting, automatically adjusting my ship's speed relative to my designated destination. This will keep me from overshooting the planet at high speed.
As my ship approaches the planet and the planet gets large in the window I will usually reduce my ship's speed again, to 50% throttle (
I have a button bound for setting 50% throttle) to slow things down and give myself more time. I maneuver my ship so the planet is "down" relative to my ship (as if I am very high up in an airplane) and try to approach the planet so that my destination is coming over the horizon straight in front of my ship and will pass under my ship if I maintain an orbit. Pitch down a bit to get the ship under the (blue) OC line so the HUD changes and the pitch ladder appears. Note I also have a button bound to 25% throttle (and one for 0% throttle) in case things are still moving too fast.
When the HUD pitch ladder appears,
If I am just trying to get down to the ground I can simply pitch down and fly downwards, so long as the ship's flight path does not go into the high or low "Red Zones" in the HUD where the ship is too steep or too shallow to achieve GLIDE. Ship's maximum GLIDE angles are variable but usually between 50 and 60 degrees pitch (
just stay out of the "red" zones in the HUD!). On the right side of the HUD is a tape showing the relative altitudes of the OC, GLIDE and SURF zones. When the marker reaches the GLIDE marker I want my ship pointed at where I want to land and my flight path not in the "red" zones.
NOTE: To minimize GLIDE time, once in the OC zone I shallow my dive until my destination is just barely above the "too steep" red zone. This offers a maximum GLIDE angle and shortest possible GLIDE down to the ground. Then I maneuver my ship so it is pointing at my landing zone and proceed down.
After the ship enters GLIDE mode I zero my throttle and if I have done everything correctly the ship should exit GLIDE mode only 5 or 6 Km above my destination. I
f it is a settlement I immediately request docking clearance and head down to land. o7