How do you terminate court appointed guardianship and replace with a POA?

I don't think that a court ordered guardianship can be replaced with a POA. Who is the guardian? Are your uncle's medical and financial affairs being looked after properly? If so, then I don't understand why you want POA?

Are you his guardian? Why is it a problem to continue in that role?

I am my uncle's legal guardian. The continuing court/probate process is a nightmare! Having to petition the probate court (trips to the courthouse) for his every need is costly and time consuming, the abhorrent complex part of legal guardianship - preparing and filing annual accountings, and most of all the very costly lawyer fees. My uncle owns no real estate and his estate is not complicated (he's not a millionaire and he has no Will - refuses to get one). I will continue to take care of him in the manner in which I have been (taking care of him and handling all of his medical and financial affairs) - I don't need the over-site of the court to perform these simple activities. I just need a simple POA. He's gotten better and is competent enough now to sign a POA (he still needs help with ADLs, doctor's appts, etc.). When he initially got sick he had no directives in place and I was advised to get legal guardianship in order to handle his affairs while he was totally incompetent. I want to get out from up under the court supervised process. This is an unnecessary burden on my life - the life of probate.

Your uncle can request a hearing to dissolve or rescind his guardianship. Now he will have to have documents to show competency (doctors evaluations) and an understanding of his person. I've seen it done for the situation when the person was too ill to manage but now had a dramatic change in their health situation & now all tippy top fine; also for when military deployment ended and so no state appointed guardian needed as the DPOA was back in the states.

i'm going to out on a limb on this, but I bet that your uncle won't present well in court. If uncle refuses to do a will, that is a problem as it shows he has a lack of understanding and perhaps a disregard for the legal system within your state - keep in mind that the guardianship judge also hears probate and no will means intestate death and a whole host of problems to the state, and the legal system due to that. If I were a judge and he showed up in my court and wanted the guardianship dissolved and refused to do a will, it basically means he is doing a "F…Off" to the judge……not a good idea. And in addition, if you start complaining about the burden / costs / time etc of being a guardian, the judge will do a court appointed outside guardian & you will be removed entirely. Please think carefully on all this before you do something that could have a whole other outcome.