I'm painting out two items, and maybe a third. I'm not an artist, so these are usually the toughest parts for me to get looking right. For me it's just about putting time and focus into it and trying to keep an objective eye. When I watch at the same 7 seconds over and over again, I can really pick it apart, and sometimes want to change things that probably shouldn't be changed. I think the frequent breaks are good for me, because when I get back into a scene, I can watch it fairly objectively.
I save the project files with the date in their name, so if I have to, I can undo what I did over the weekend, if its not working. And I use the undo button a lot. This project is my first real attempt to do these kinds of FX. And I have a lot of false starts.
The upside is there will be plenty of deleted scenes in the extras. :)