For a "daily driver OC" - On a basic level, you're increasing the all-core CPU multiplier while trying to keep voltages as close to stock as possible. It seems all-core 4.7GHz is within reason here, depending on your luck with the silicon lottery. Make sure to check CPU voltages before you start OCing. If you leave the mobo voltage settings on Autio, it will supply more voltage than what's needed to keep the CPU stable (the mobo errors on the conservative side).
You can go at CPU OC from two angles:
I prefer to lock the vcore (not Auto voltage) and increase the multiplier until I hit instability.
Leaving Auto voltage on and increasing the multiplier will help you find the MAX OC that the CPU is capable of (5-5.2GHz seems to stick out on google searches), but that's probably going to be temp/power limited @ a higher voltage than you'd want for everyday use. From there, you can turn back the voltage to see how low you can go before you you're limited by not enough voltage. Intel's XTU can be helpful in telling you what wall you're hitting.
Where you go beyond that point is up to you. Google around. There's no black-and-white number for a safe CPU voltage beyond the stock voltage.