This is a topic with MASSIVE depth of detailing techniques and skill.
First off...have a visit here
www.detailcity.com ALL your questions will be covered here
Search with my user name:
Tarios
and you`ll have a lot of help.
Let me run it down for you a little more deep than the guys on top. I'll refer to your truck as 'car': so all you Xterra-name cops out there...take it easy
Your finish-meaning your paintfinish will ONLY be as shiney and clear as your base coat cleaning.
You can't expect high gloss finish and deep shine if your base isn't cleaned properly.
Wash your car with dish washing soap.
Like mentioned above it will strip away all that old or crappy film lft behind from your Turtle wax.
Then get a hold of a clay bar" Thsi is something that looks lke plastersine and what you will do is with a hose or spray bottle..wet aout one square foot area of teh car and just lightly rub the clay bar over it in a BACK and FORTH motion.
Bumper to bumper direction on hood and top..and door fenders and quarter panels...all back and forth only.. Forget that circular motion stuff forever... It's over.
Here what you are doing is removing 1st rail dust that has probably been on your car since delivery day, and oxidation caused by road grime and other contaminents.
Your xterra's finish should be clean now.
But get in in your head that you want to use cloths and MICROFIBER towels for ALL paint surfaces.
DO NOT use rags, or towels or anything with an abrasive feel..yes some towels scratch the hell out of your clear coat.
Someone above mentioned to you to use a BUFFER.
My friend if you don't know how to use wax or anything on this topic...STAY AWAY from a buffer..
When I say buffer I am implying a ROTARY macine.
This is strictly reserved for professionals and people who are basically in the business. No offence. but with your qustion on this post, you should stay away from any rotary machine..period.
If you want to use a machine ..get a hold of an ORBITAL machine. Porter Cable make the IDEAL machine for beginners and pros alike.
PC 7424 unit is amazing. This machine oscilates in a back and forth motion and therefore doesn't spin in one direction which avoids burning your clear coat right off. A rotary machine is bascially the equivalent to a Dewalt Disc Sander or Disc cutter..thats what a rotary looks like..obviously theres different models..but it looks like a disc cutting tool...so imagine how powerful they are...even with various speeds....you can't use a rotary to remove deep swirls in low speeds anyway...it's got to create heat and with a right pad..PLUS using the right product..that alone is another volume.
If you will be doing ANY kind of compound or polish..
A machine like this is great.
You can go by hand as well...but a machine has it's benefits.
Now if your finish is really bad..you may need to use a light compound swirl remover.
There are different grades..I don`t think you ll need that grade of compound that would require you to use a Rotary machine with a wool pad..because if your car is in that bad a state..you might as well bring that X to a detail shop and ask them to do a light Compound for you.
This is the step that will allow you to POLISH your truck the right way.
What we do here is:
COMPOUND:
Removes a VERY FINE layer of clear coat, we're talking less thickness than a hair.
Here we remove the most serious stage of oxidation.
POLISH:
Here we are polsihing the clear coat and giving those compound finishes a wipe down and giving the clear coat a rich deep gloss finish.Kind of smoothing out what the compound had to do to remove the fine scratches and swirl marks.
WAX:
Wax is simply the protective shell over your hard work..I final finish and something that goes on relatively easy.
Invest in some Micro Fiber towels/cloths.
3M mkaes some and they're sold at Wal Mart..check in the kitchen cleaning department..they are simply amazing for remvoing polish. wax...just use them after every application of whatever you just used, as a cloth to wipe the whole car down with.
I ran out of time to continue here..I'm at work..
But if you like.. email more specific questions and visit that site I mentioned to you above...
HTH you out somewhat.