For a 1.5" drop, you DON'T need C/C plates. You will only need them if you go past 1.5 - 2.0". More like 2.0". You also DON'T HAVE TO get a bump steer kit. However, you should get new shocks and struts as the stockers won't last past six months on lowering springs.
For the front, remove the tires. Put a jack under the lower control arm. Unbolt your strut, and lower the
control arms until the stock spring is loose. Careful with the brake lines. You might have to jack the car up pretty high in order to give yourself enough room to lower the arms. Keep lowering the arm until the spring is fairly loose. Don't stand right in front of the spring while you do this. Wiggle the spring out, and swap in your lowering spring & strut if you got them.
If you did get C/C plates, then scribe the stockers positions for reference later. Bolt the crap back up and raise the arms in order to get everything to fit.
For the rear, you'll have to unbolt the shock from inside the trunk and repeat the process you did for the front. You can use the rear axle to lower/raise the
lower control arms though, and make sure you have a jack under the axle side you aren't working on a tthe moment. You may have to remove the rear calipers or brake lines if you find the brake lines are getting tight. You can also raise the opposinte side of the axle that you aren't working on in order to lower the end that you are working on.
As always, use the search button at the top right the next time you want to ask a question.