After you take off a few times you won't even notice the pull to the left, kicking in a little rudder will just be normal for you. When I first started flying I learned on a TD, trikes were a big mystery for me. I had one small Fokker D-VII that was a serious ground looper and my hitec radio had a take off switch so I tried that, I just programed in a couple degrees of right rudder for take offs, it worked but I think I used the switch only one day. Once I figured out it only took a little rudder to correct the pull problem take offs were easy. Just take off a few times and you will get it. Your only moving the rudder about 10 degrees so it isn't much. I never use expo on my rudder, I want 100% control and I want it to move as soon as I touch the stick. If I add expo I tend to get behind the plane and over correct.
Don't start folling with things, just fly it and get the feeling for the control. I bet after about three take offs you will have it figured out.