If you've no experience using a DA polisher I wouldn't suggest you go any where near your P&J with it. If you really want to go this direction atleast get an old bonnet or panel to practice on first....
If you decide not to use a DA,then a product like poor boys black hole is full of fillers and will help hide your paint imperfection and a half decent wax like soft99 Fusso king of gloss to seal and wax. Both products are cheap enough and won't break the bank and give you good results
dont think you know as much as you think. DA is as safe as you can get, the polisher will stop spinning at angles it finds too much pressure from unlike Roterys which creates heat at a much faster rate and can burn the clear 3-5+ times faster then a DA.
A Da is super forgiving in that you can be a first time user, watch a video on youtube and do exactly what they do and succeed more or less. the outcome depends on what kind of paint it is, which pad your using (polishing pad, medium cutting pad or heavy cutting pad) and the cutting ability of the compound/polish being used... usually alfa paint/fiat paint is soft so a medium green/white foam pad with a medium to heavy cut compound will be fine for 95% of the scratches. technique, pressure and speed within that technique also apply s but that will come with the hours you spend doing it.
doing a whole car thats never been compounded/polished before takes.. 15-25 hours and that only gets you to.. 90-95% ish of the scratches. this includes a pre rinse, a degreaser, a de ironing, a soapy bath and then claying the car for the remaining contaminates in the paint. only now can you start polishing your car.
Compounding: using heavy cutting materials to level the scratches, this creates micro marring or hazing
Polishing: Using lighter compounds to level the micro marring/ hazing and get the shine out of the paint.
waxes and sealants dont bring any shine to the paint, its for protection. you can fill the scratches with fillers/glazes all you want but it will only last for a few weeks and the scratches come back.
The shine comes from leveling the paint and cutting down on the hills and valleys of the scratches by compounding/polishing the paint.
How to safely wash a car:
This would be just a spray on: IronX, Tar X, Mac 124 Prickbort
Step 3: Clay
Step 4: Compounding And Polishing
any DA with 500+ watts is fine. they cost like 90 ish. more watts the better tho.
can do this on wheels as well:
I did both of these on my car except i did a ceramic coating meaning i put a 3-5 year clear coat on my car so the dirt will repel easier and wont stick as easy on the paint: http://imgur.com/a/lutAj