No, you decide yourself whether you want to contact a lawyer. It varies from case to case whether legal assistance is necessary. In many cases, it may be an advantage to seek assistance from a lawyer.
If your child has been abducted abroad, the Central Authority or the courts of the country to which the child has been abducted will normally help you to contact a lawyer who can conduct the case for you before the foreign court.
Please note that in principle you have to pay the expenses for legal assistance yourself.
You can find more information under the subject Financial assistance.