1. The easiest way to do this is to go onto Co-op mode, get a bt in the heli with you, they aren't very good pilots but will keep it in the air while you practice shooting.

2. Learn to fly alone and Switch seats to kills, this wil get you more kills and is far less frustrating then trying to get some nOOb pilot to fly. It is actually alot easier than it looks and will make you look extremly leet while getting some farily easy kills. Fly your heli up high, point it slightly to the left of the target tey and keep the heli as level as possible, switch seets, right click to get into the TV screen wait for the heli to line up with the target and fire. Keep clicking on where the target is, and dont worry about your heli, unless you fire at the far side of the map and take along time switching it should be fine.

If flying:

Fly high!!!, Fly high!!!, Fly high!!!, I just cant say it enough. Not excessivly high, just comfortably high. As high as you can get while still travelling forward. While it may seem leet to fly as low as possible, you will get your gunner no kills, you prevent him from shooting or spooting the enemy, and it doesn't make you invisible. Keep a look out for enemies(using the look around the cockpit feature) If you see an enemy, stay back, spot it for your gunner try and line up your gunner as best as possible. If in a heli fight, line your gunner up until he gets his first Tv off and then do a barrel roll, to avoid the enemies missile.

A great pilot cant do ridikulous triks or anything, they just fly high, steady and spot the enemies early. Suprisingly quite alot of pilots do not do this and its like you are fighting them to try get a kill.