Change in Signature

hello friends,

my cousin brother wants to change his signature..he feels that his signature needs to be changed..he had put his old signature in all the documents till now..now if he changes the signature, he is anxious to know what problems he will have to face..but he wants to change it..he also wants to know the procedure to change the signature officially..

kindly send your suggesstions/ advises regarding the procedure to be followed.

thanks