Selling a property that's part of a trust can get complicated, so it's a good idea to get a handle on the process before you start.
Each trust is different. First, talk to the trust's lawyer — ideally the one who was involved in setting it up. They will be able to check the terms to ensure whether its assets can be sold (some are protected from sale).
Check the trust has an IRD number — you will need one to sell the property. There may also be tax implications, depending on when it was bought and whether it is the main family home. If the property can be sold, all the trustees must agree.
A legal resolution documenting the decision to sell must be signed by the trustees.
Once this is in train, start thinking about how to sell the property. Selling it privately will need a registered valuer's assessment, a requirement of the Trustee Act. But while a private sale can save you money on commission, it can be complex.