In the US it is done as follows:

1. Do it yourself
2. Get an attorney and he charges nothing up front but if you win he gets 25% of what you get (they pay you all the way back to when you first applied so the attorney gets 25% of that up to $6,ooo). One of the reasons you have to get the right attorney is some of them want it to go on a long time because the longer it takes the more they get.