Is it an easy process or should I ignore putting in the fan altogether? How much does it really help? My main reason to ask was because I initially wanted a green led fan. My room is already cold, so Im not sure if I need it. On my Z77-V Pro Mobo and with my EVO cooler on the I5 3570k 3.4Ghz in bios i was reading 32C.
IMO, Side fans don't really do a great deal of cooling. It will reduce your temps by 1-3C & since there are no dust filters on the side panel, they pull dust inside your case.
Since your planning to add a 200mm fan, the temp. decrease might be 3C+
Its really your choice, you can add that green led fan to make your case look good & further reduce your GPU, CPU temps as well.