Never done it, but wouldn't recommend it either. I think coming up with the asking price is something best left to a pro. An appraisal from a reputable appraiser can help you, tell him/her you want their honest opinion about asking price for the subject property. If you want to sell on your own there's also some good "how to" books for more info.
I would say commissions for excellent RE agents have gone down considerably lately, I think their knowledge and expertise is worth the price.
GL on whatever you decide.