So how difficult is flash?
On a modern camera: not difficult at all. Just put a big flash on your camera hot shoe (e.g. a 430EX II if you use a Canon camera, or an SB-600 if you are a Nikon user), turn the head away from the subject, and reflect off a wall or ceiling, and shoot. Done! You can even use Program mode without “slow flash”
To illustrate that again, here is a nice gentleman on one of my courses the other day. He asked me for the picture but never emailed me with his address, so I will put it here for him instead.
First, how not to do it: aim straight at the subject. Oily skin, flat face and harsh look with many shadows will result. Click, and look at the big image to see what I mean.

Better: aim the head up and bounce off the ceiling. Especially for women, but for men too. Bounce behind you if you are close. Result. much softer light, and you get some light into the background too:

And to introduce character (especially for men), aim at a wall instead, above the subject. You now get this:

Easy. And it is unforgivable if you use the pop-up flash on your camera after seeing these images.