how many programs can I run on a G4

I am considering purchasing a used G4 ibook because I am on a budget and can't afford a macbook right now, but I need something to edit my work with. The used mac I am looking at has these specs:
G4, 1.2ghz 768 mg RAM 150 Gb hard drive and OS X v. 10.4.11
my question is this can I run CS2, soundtrackpro and soundslides plus on this machine or will it be it just slow the darn thing down untill it's not useable, I can get a good deal on this used one so any suggestions on how to beef up the RAM would be appreciated as well
thanks

Maximum RAM will help what you want to do. The maximum memory capacity of the system is 1.25 GB - with 256 MB onboard and a 1.0 GB SO-DIMM.
http://www.everymac.com/systems/apple/ibook/faq/ibook-type-of-memory-used-how-to-install-ram.html
Don't expect lightning speed from a 1.25 processor with those heavyweight applications running simultaneously. And don't try to go beyond Tiger.

I use Photoshop CS2 on my machine and it works without a hickup. I do photo restoration work with ease on 300dpi images.

My pc laptop which was also 1ghz did process raw photos a lot faster than the PowerBook I use today.