Can i just use photoshop cs4 to rotobrush footage?

Question

there is this new feature I have seen in after effects cs5 called rotobrush. at first glance it appears to be a photoshop selection tool that has been ported over to after effects. is this correct? if so can i just use the video features in photoshop to achieve the same effect? I am struggling with a green screen shot where the screen is reflecting in the side of the car. i may need to just lose the green screen altogether and shoot the car and actor against a kind of uniform brown background and rotoscope the actor and car. instead of upgrading to production studio cs6 perhaps i can already do what i need to do with my existing software which is cs4.
thanks in advance
Angus

Answer 1

I looked at the two clips, and I'm sorry you're so far into the project.  Bad reflections.  Unwanted shadows.  I noticed you wondered out loud, "How do they do it in Hollywood?"
For starters, they use visual effects people with years of training and experience.  They have photographers who already know how to shoot for visual effects.  Frame One never gets shot until they KNOW things will work. 
The only time they shoot just on faith of success is when they shoot test footage.  Not in production.
In my opinion, you're at this metaphorical point:
You're sitting on the limb of a tree, working hard to saw the limb off.  Unfortunately, you're making the cut between you and the tree trunk.  Once you realize the mistake, you have two options: stop immediately, give it up as a bad job, climb down and try again later... or keep on working and fall hard.
Thus, I offer advice you won't want to hear: stop right now.  Cut your losses.  Don't waste your time and money until you get the knowledge you need.
This is a good and comparatively inexpensive  starting point.