Will, Final wishes, etc.

I have a Will made out and my Son as Exucator, but I don't believe he wants to do it.. I have a Power of Attorney and a Living Will also. My final expenses to be cremated are paid for. I am retired at going on 70 yrs of age, health isnt really bad. My Will is just a simple one, I don't have assets, I only have furnishings and personal property. A Car and household items in my aptartment. I was just going to have my son donate, give away or pitch items or take what he wanted. Really I guess its mainly a cleanup of my apartmnet and to dispose of items. As I said I dont think my son wants to be bothered with it or me. So whats involved in hiring a lawyer to go over my will and make any changes and act as Exacutor on my passing. Does he need to be on retainer? Would a lawyer even do it ? Something so simple. What kind of expenses would I be looking at? I dont know what other type of questions to ask.