rear springs

I would suggest you use spring compressors, people have gotten seriously hurt without using them. However if you have a car Jack and compressor springs, it's a few bolts off the back springs and it's a little more in depth with the front.

 

Why would you need to replace springs on a 2015 car? Car coil springs last decades of abuse before beginning to sag.

 

Removing the rear springs is as easy as disconnecting the damper lower bolts and letting the torsion beam droop. Pull old springs out, put new ones in. But I agree with the above--why on earth do you want to replace 4-year old springs?

 

If you need more load carrying over bumps just add Firestone load air bags inside the spring it easy only a few minutes i suggest lube them up with lots of dish soap makes it much easier.
I filled mine with nitrogen just because I have it as part of my job supplies. Only 5 PSI when empty upto 30 PSI full load.
Daly I have over 800 lb minimum we’ll over 1000 lb to 1200 lb plus a trailer when fully loaded going to a big job.