Good video/guide to mating with two bishops?

I can not seem to get this down. I get close to getting the enemy king in a corner, but somehow he threatens one of my bishops and makes me move it, gaining a tempo, and he goes back to the middle. It gets really frustrating.

Any advice?

Thanks very much.

This video really helped me:

http://www.youtube.com/watch?v=YHJqBilVLPU

I think it will work for you since you said you can already get the king into the corner.

You can always try the computer workout:

http://www.chess.com/computer-workout/server/mate-with-two-bishops

The idea is to keep the bishops on neighboring diagonals and force the king into a corner, then use that corner's color bishop (light or dark square) to mate. You need to use the king too. Using the "best move" buttom will show you what the computer says will mate the most quickly, this should demonstrate the basic patterns.