CLIENT would be a better answer i think
client
The opposite is impatient.
I don't think there is an opposite of lawyer. Unless you'd consider: Lawyer = Someone who understands the law. Average Citizen: Someone who does not understand the law. Otherwise, I don't see an answer for this.
The opposite of patiently is impatiently or anxiously. Referring to impatient actions, it could be hurriedly.
Patient
I'll consider this to be a vague question. If I had to rewrite the question, I'd put it this way: "In a court of law if a defendant is represented by his/her lawyer or attorney, then what is the opposite of the defendant's lawyer?" The answer in this case would be the prosecutor, also an attorney/lawyer, but with opposite goals.
Informed
Impatient
client
No - you could be a plumber, a spy, a layabout, a mental patient, a ... ah, make up something yourself. But, you don't HAVE to be a lawyer!
Position one person on the opposite side of the patient
The opposite person, the recipient of healing, is the "healed" (a patient or sufferer).The person who does the opposite is a "harmer" or "injurer."