Ditto on pseudoknot...the more experienced providers are aware of who the new guys are, and they won't throw you in as lead provider on a trauma...your first couple months expect to be doing the "subject fallen" calls...find out who the best teaching providers are and ride with them, they will slowly get you in a comfort zone...
I did a bunch of traumas as an EMT where at a minimum I had another EMT with me (very rural, no ALS some nights)...fights, minor accidents, falls, the such...
I didn't actually come across my first nasty severe trauma until I was out of EMT-I school... 18 wheeler vs parked motorcycle...nasty...but by then I had seen enough that it was more of a go-with-the-flow than stop and stare at the breaks and gashes...I did my assessment, stuffed the bleeding holes, had another emt hold cspine and we were gone in 6 minutes...moving on to trauma centers...
This guy went to the closest hospital, which happened to be a very well equipped level 3 trauma center...emergency departments come in 5-6 types depending on the state
Level 1 trauma center...comes with all the bells and whistles, residents, full range of specialties...equipped to take whatever you bring to them, from trauma room to discharge
level 2 trauma center... a step down, isn't required to have residents but still has a pretty good range of medical and surgical specialties to handle the patient
level 3...a regional trauma center...equipped to handle most traumas, stabilize and transport, surgery on call, and fly-out if the pt is stable enough
level 4 in some places in a local package and transport type trauma center
Regular ED's - not trauma centers, but they can still take trauma pt's for stabilization and treatment if they are minor
There are also others...peds, burn, cardiac centers, stroke centers, etc
In the field, your state will typically have a protocol to help you evaluate when a pt needs to go to a trauma center or not...
If a trauma center is not your closest facility, then you will typically be doing a flyout, where (once you are approved for the helo) the flight physician/nurse/medic will determine the exact hospital to go to
Hope this helps out a little bit, it's a very generalized statement but some variation of it is present across the country