So i've been playing for quite a while and figured out some of the little things that make it ALOT easier
1. The easiest way to start is not to leave from a run way.
Figure out an area you want to fly around. If you want to fly around your home town, find your house and mark it. Then, tilt the camera angle down until you are about level with the horizon around 8000ft. Then hit "Crtl-Alt-a" and pick a plane, and click the option "start from current position. You will immediately start flying so click your mouse to get the cross hairs and you're off!
Fly around your town getting used to the controls
2. Make very very small movements with the mouse.
3. Throttle and flaps control
I find it easiest to fly at full throttle. (press the page up button until the meter all the way on the left is at the top)
Secondly, learning to use flaps will help you a ton with turns and slowing and speeding up the aircraft. Hit the F key to increase flaps. this will cause the plane to rise so be ready. At full flaps and roughly half throttle is the best way to make tight precise turns.
4. Finding your way around.
Use landmarks like highways or bodies of water that you can recognize. I flew from Boston MA to Plymouth NH which is about 100 miles by following the same highway I would drive on. i then knew that Mt. Washington is roughly north east so i turned a little to the right and flew until i saw taller mountains and towns.
This is probably the best easy examples i can give. But make sure you read all of the directions on that guys blog and watch the videos. they help a ton.