There are online CEVO and EVOC programs. Treat yourself to one if you are this concerned.
No you wont get the practical portion but you will have the basic knowledge.
Then, when on duty..practice practice practice.
Ask your employer if they will set up something for you, argue that it is cheap training and it reduces their liability. Cheaper for them no as opposed to later.
In your off duty time, see if any friends have big trucks you can practice with and use your mirrors only...either cover your rear view mirror and black out the rear window or do your best not to use it at all. And then drive around a safe place using only your side mirrors.
Rent a UHaul for a day...drive around town (buy the insurance).
Once you are comfy in non emergency mode, the emergency part is easy IF you use good judgment. There is no need to be driving at excessive speeds or weaving in and out of traffic, on medians or curbs. Drive normal, slightly above posted speed limit when safe to do so, allow traffic time to react...do not get on their rear ends and then get upset when they do not move within a nanosecond.
Start braking long before you need to...what you say? Exactly...when approaching intersections, look at the lights, are they going to change soon, have they been green for as long as you could see them? That means it is going to change soon, so start slowing down by letting off accelerator first, then hover over the brake pedal.
If light is red, again let off accelerator, start coasting, then apply brake. Stop completely at the red light. Look both directions twice, then proceed.
Always remember, this is NOT YOUR EMERGENCY. There is no need to create another one or make one your own.
I will think of more later but this should get ya started and others will chime in...