Qui facit per alium facit per se – this is Latin maxim, used in the area of Authorizations and Agency Law. It states that a person, who acts through another person, is considered to act himself, although not being physically in person there. Usually this is part of the lawyers’ job – they are often authorized by clients to perform legal actions on their behalf and for their account.
Note that lawyers and attorneys-at-law, do not work for free; their job is paid and should be respected, so when asking a lawyer for performance of legal activities on your behalf, or for their legal opinion on a concrete legal issue, you should pay them for their opinion and legal advice; it is the same like when you visit a doctor and pay for diagnose and medical treatment.