Here is the thing. The serp belt drive the power steering pump and power brakes. So you will have hard steering and harder brakes(you REALLY got to push down on the pedal to stop)
2. When the engine is running, it is compaable to turning on the stove element on qute high with a pot of water(coolant) on top. Because the water pump is also driven by the serp belt, no cool water is continually added to that pot. But the pot is continually being heated.
Running the engine is the continual heating. You would want to get there fast.
But you also want to be able to stop there
And steer to get there.
The belt broke. There is a reason the belt broke. Find out the reason before you put on a new belt or you will be driving to the station to put on another real soon. Hopefully your mechanical observational skills are up to it. Other than that, take your time and do it right.
Always remember " some monkey put it on before, so it must fit".