Blend in with the surroundings, become one with the environment. Like a ninja, but less... ninja-y.
Learn to wear a fedora, a trench coat, and a pair of sunglasses to confuse the enemy.
Walk like a ghost, move like a leaf. Practice your 'Sneak-Fu' in a local park or empty parking lot.
Don't get caught, or you'll end up on the 'Stealth Bombing Hall of Shame'.
Invest in a decent pair of night vision goggles, a silenced pistol, and a 'Stealth Bomber' branded water bottle.
These will make you the most feared (and ridiculous) operative in the field.
Remember, Stealth Bombing is all about subtlety... and looking like a total tool.