You can change lawyers midway because these are general agency contracts. If you are not satisfied with your lawyer, you can hire another lawyer.
Criminal Procedure Law
Article 45 During a trial, the defendant may refuse the defender to continue to defend him, or he may entrust another defender to defend him.
Article 33: In addition to exercising the right of defense, criminal suspects and defendants may also entrust one or two people as defenders. The following people can be entrusted as defenders:
(1) Lawyers;
(2) People recommended by people's organizations or the unit where the criminal suspect or defendant works;
(3) Guardians, relatives and friends of criminal suspects and defendants.
Persons who have been sentenced to a penalty or deprived or restricted of personal freedom in accordance with the law may not serve as defenders.
Persons who have been dismissed from public office or whose practicing certificates as lawyers or notaries have been revoked may not serve as defenders, except for guardians or close relatives of criminal suspects or defendants.
If you plan to change lawyers during the lawsuit, you can seek legal advice.