Ok, a quick little how to for ya.
If you have an impact, use a 15/16" Socket and take the pulley nut off.
then, if you have a big roll of tape you can turn the alt upside down and the roll of tape will hold it nicely while you work on it.
Find the correct torx bit and remove the regulator. Take a small screwdriver and push the brushes in while you insert a brad nair or paperclip into the hole to retain them and set the regulator aside. Make sure the nut on the main power connection is off, and don't lose it, it's really hard to find a replacement! Now take an 8mm socket and remove the 3 bolts that hold everything together.
Once those are out, lay the alt on it's side and use a hammer on the corner only to tap the rear case off. Swich from corner to corner to walk it off.
Now, DO NOT PRY ON THE ALTERNATOR AT ALL!!! You will pull stator (part with all the wires) from the rectifier assy. This will ruin your alt unless you know how to repair it.
Instead, gently tap the case all the way around a few times. Now, situate the alt so you can get a descent swing at the mounting ears. Hold the rear part and tap the ears going back and forth. This will walk the front case off. It's a good ides to run some of the parts on a wire wheels to clean them up while your case is getting painted/powder coated.
Now for a personal word of advice having dealt with these alts for years:
DO NOT POWDER COAT or CHROME PLATE an alternator! If you coat them with anything accept a thin paint you'll end up creating a barrier where the heat cannot escape. A 3G alt is very efficient by design, and it does so because of it heat dissipation abilities, which are seriously hindered when you coat them with anything.
Trust me on this, we used to get people bringing chrome plated alternators in all the time and they'd say "I only had it a few weeks on there!". And we'd tell them the same. For shows it's ok, but not for daily driven vehicles!
Another good alternative is polishing, if you need help with that I know someone that does it for me locally.
Good luck and don't hesitate to ask questions if you get stuck! I also have a way to pull an alt apart without an impact if you have a bench vise.