Ever play that game, "hotter colder" as a kid?
Planetary landings are like that, but level 10. Lol
It's easy once you get your bearings. *Pun*
Say you need -140, +60
You drop in to Orbital cruise at +10, -30
Pick any direction out of a bearing of 0, 90, 180, and 270.
When "+10" starts counting DOWN, keep going until it reaches -140, then throttle back. Then assuming you chose to face south, then face east or west, and fly until the "-30" starts counting UP, until it's at +60.
Once you're close enough, drop down to normal flight, and refine it further.
To begin with, it's best to use just one bearing (0, 90, 180 or 270) at a time, but eventually you can use two at once. I can find coordinates pretty quickly now without tools.
CMDR Cosmic Spacehead