There are many factors that get considers to determine the value. Consult with your current attorney and have them go over the full details. This will provide for a better analysis.
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You can switch lawyers at any time. However before making the decision to switch express your concerns with your current attorney. If you unsatisfied at that point, consider switching to another attorney.
Consult with a local personal injury attorney in your area. Many personal injury attorneys offer free consultations. Avvo has an attorney directory titled "Find an Attorney". This is a great place to find a personal injury attorney in your area.