I have found that meditating beforehand actually increases the amount of fear and anticipation I feel, as no matter how much I am successful at blocking thoughts from my mind, my body anticipates the challenge that may be coming.
Every time shortly after I come down from DMT, I notice that the fear has totally evaporated and I often find it humorous that I was so afraid just 15 minutes before. This has led to me re-dosing in the same evening as there is no fear barrier left. I have also read some accounts here on the Nexus about being able to dive deeper into the experience after getting the jitters out with an initial journey followed by one (or two!) with a larger dose.
I have also found that jumping right into it without planning days in advance mitigates some of the fear. Saying randomly when the feeling strikes, "I am doing this, right here right now" for me cuts down on the anticipation I feel. It was like with asking girls out in middle/high school: I would always be far too nervous if I planned it hours or days in advance, so the "ripping the bandaid off" method came in handy a few times. Good luck!
"Think for yourself and question authority." - Leary
"To step out of ideology - it hurts. It's a painful experience. You must force yourself to do it." - Žižek