J.
We did it, with both our boys. It was much more difficult for me (it's awful to listen to your child cry) than I ever expected, but it worked well and quickly. At about 9 mos., after a cold where he got a lot of attention during the night, my son decided he wanted me to watch him sleep. He would lie happily in his crib as long as I stood over him, but as soon as I would leave he would cry again. Clearly neither one of us was getting much sleep so we had to do something. We read the Ferber book:
http://www.amazon.com/Solve-Your-Childs-Sleep-Problems-Ne...
and basically used his method. It was hard but it worked quickly and I never felt like I was being cruel. Very firm, but not mean.
My kids (4&6) are both wonderful sleepers now and have been for many years, and I really credit this book.
Good Luck!
-J.