If you are not satisfied with your lawyer, can you just hire another lawyer? Or is there a set procedure that has to be followed?

the answer depends on where you are in the process of your lawsuit and what type of matter it is.  If you do not want to keep the lawyer, but its right before the trial, there could be some problems.  usually the only procedure required is to notify your attorney in writing that you do not want him or her working for you any more and ask when you can pick up the file.