In order to get letters testamentary, you need to probate the will and seek appointment as executor of the estate. You cannot act as executor until then. Also, if the trust was created by the will, then you are also not the trustee until the will is probated as well.
You will need to get a probate attorney to assist you. Executor's must be represented by counsel. Also, you may have probate alternatives available to you and a probate attorney will be able to go through these options.
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For the trust assets, you need only to present the trust and a death certificate to the persons with the assets. They should change to you as successor trustee under the instrument. If there are non-trust assets, the will must be probated to get you letters testamentary so you can transfer the assets to the trust
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