You will be fine with the TH, the newbie runs are specifically for people like you.
You can certainly do a level 1 or 2 trail, however I suspect you will want a fair bit of experience under your belt before taking your nice new truck on a level 3 trail. A level 4 trail ramps things up quite a bit and will be hugely dependant on driver skill and experience more so then the rig.
You will have a great time on the newbie run though. It’s cool to see a TH acctualy on the trail.