I started overclocking not long ago and I can tell you that it is quite easy. The 6300 is a very OC capable CPU and the MSI 970 motherboard is also a great overclocker.
For overclocking, all I can tell you is that you should increase the multiplier in small increments until it is unstable, then you can begin upping the voltage until it is stable and increase from there.
There are a lot of overclocking guides out there and at the end it all depends on your chip for the overclock you can get but I hear many people can get from 4.2-4.6 with a 212 evo.
Good Luck!