Hey, glad to see this build is getting some love!
Actually, this was a super simple paint job. Basically, I disassembled it as much as I could before painting, but did no prep work to any of the parts aside from cleaning them from any oils by wiping them with a clean cloth.
You'll find that the pommel unscrews into two parts, then the black plastic grip slides off. After that, I believe the upper bowl on the guard disassembles as well, but I didn't remove the plastic wings before painting, as they seem to be glued in. The blade is permanently attached to the lower part of the hilt, so I just masked the gem and the blade carefully and trimmed the tape with an Exacto knife. Then, I just painted the parts in my front yard, a few hours between coats, then waited for them to dry fully before reassembling.
No post work aside from touching up the details (which I just overpainted because, as I'm sure you've noticed, they needed to be redone anyway. I hand painted those with a brush, because I don't have an airbrush at my disposal. The paint is chipping a bit on the edges of the pommel, so I would recommend some sort of sealer to prevent that from happening on yours.
All in all, it was a pretty simple build. Just go slow and take your time. I got mine done in an evening, so it didn't take me all that long even when I was taking my time. It's just a simple repaint, but boy does it make the sword stand out.
If you have any other questions, I'd be happy to answer them as best as I can.