The grantor should make you familiar with the trust and its provisions. You need to know where the trust document, trust assets, insurance policies (medical, life, disability, long term care) and other important papers are located. However, don’t be offended if the grantor does not want to show you values of the trust assets; some people are very private about their finances. This would be a good time to make sure appropriate titles and beneficiary designations have been changed to the trust. (Some assets, like annuities and IRAs, will list the trust as a contingent beneficiary.)
You also need to know who the trustees are, who successor trustees are, the order in which you are slated to act, and if you will be acting alone or with someone else.