Provintial Bar Associations have a chart of minimum fees that lawyers can rise up.
The fees will vary proportionately to the amount you are claiming.
In Cadiz, for instance, a claim of 100.000 € has a total fee of 13201,35 € ( VAT included), if there is an out of court settlement, the rules of the Bar association indicates that just the 30% of that total fee will be charged, which in this case will be: 3960,41 € ( VAT included).
Once you find the right type of lawyer you want to use, the essential and most important thng is to ask for a full buget of legal and related costs beforehand. You can also compare among a couple or three.