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It's not that hard, but I'd not feel comfortable trying to explain it ... someone else is likely better suited to guiding you if you've got no experience at bios settings. If you've got a friend, they can check it pretty quickly.
Is it a new PC that you still have customer service / tech support? If so, and you call to report it as a "malfunction" ... running too slow, etc ... the tech support will go looking for the culprit with you ... steering your through the steps to figure it out, be it this or something else.
We had to go through the iterations of protocol @ latest drivers, etc. before we got there ... but we got there. You might be able to "prompt" them to check for it sooner, rather than later. Or they may simply say, "Nope, not that, yours doesn't have Optimus."
I read elsewhere that Optimus is going into desktops ... so, it is viable to at least check for it.