eAquino :
Is replacing a 4460 with a 4790k plug and play?
It depends on your motherboard. If it's a Z87 or an H87, it may require a Bios update before you can use it. Also, before buying an unlocked processor, you should make sure that your motherboard allows for overclocking, or having a ''k'' won't be of much use. Updating your bios is fairly simple, just follow the manufacturer's instructions.
Also, if your computer had a CPU cooler that wasn't Intel's stock cooler, you'll have to remove it and re-apply thermal paste to the connector. Ignore that if you don't, since you'll get a new stock cooler with the 4790k, which will already have thermal paste on it, but won't be powerful enough to cool an overclocked CPU.