Pre launch?
I get anxiety with everything that's exciting and dangerous. I'm new to DMT but I can say it's powerful, I call it the drug for the gods. So anxiety is normal, anxiety is your ego's fear attempting you to stop and stay safe. Just reassure yourself with research and the fact it's a natural substance that is released when you dream and every living thing has it. Maybe if meditate on these thoughts for a bit while doing breathing exercises? And try using really relaxing music, music you wouldn't normally listen to. For example, I've used native American meditation music and it isn't music I'd normally listen to am very much a hip hop/rock kind of guy, it relaxed me and went well with my trip.