Talking about it openly with your T, a lot! And time....lots and lots of time. Took me 2yrs to fully trust T. Some stuff didn't even come out until year 3(5yr relationship)
T thought that I trusted him long before I did and once I brought it to his attention, that I indeed did NOT, things got better. He assumed that since he was doing all the right things, that I was capable of following along with him. That trust had been formed over a period of time and with him being available, safe, validating, etc. He really didn't know how incapable I was of trusting him until I brought it to his attention. It was amazingly helpful because he was able to change how he was working with me, and this benefited us both!