No time to learn shading stuff just yet...so my question is this.

My game maps would need patches of grass, trees etc all with these gr8 shader tweaks etc. Would like to add this later, once more of the core elements of the game are in place. Is this possible etc [presume it is] and if so, what things are worth taking into consideration now? Can you reverse engineer levels to use new shader options?

plz forgive if lingo isn't accurate