No I didn't the house I sold was on a very busy main road so lots of passing trade so to speak and that was all I needed. This was a couple of years ago and my house was desirable, (good area sell like hot cakes).
When I sell this house I will try and sell it myself again, but I will have to use the websites as I'm hidden in a dead end so no passing trade.
I havn't any advice as to which I would use though as I havn't looked into it, but I would be considering looking into selling nationally as my house would be more attractive to people further afield (small village tucked away but excellent commuter links).
Would also do local and national adverts in the newspaper, not just in the property section but in the classifieds and take out a regular advert.
You have to decide who to aim your house at, if its a city flat, or a family home in commuter land send emails to big companies, they sometimes buy properties for employees, particuarly international firms).
Once you have sussed the advertising then the rest is easy, you discuss the offer and then refer it to your relevant solicitors and they do the rest. You will have to do the communicating and chasing up with each other but IMO that is better handled direct than through an agent.
It will still cost you money though, so if you are selling a cheap house and could get an EA with fees around 1.5% way up what that cost will be compared to how much it will cost you to run adverts etc.
I think you make more savings if you are selling an expensive house.