You don't want to use any software or auto overclocking tools on your system. They tend to only overclock a little bit, and are far to generous with the voltage.
Overclocking really isn't that dangerous, as long as you are careful. Typically if you don't increase the voltage, the chances of you damaging it are slim to none. Most Intel processors Sandy Bridge and up (yours is a Sandy Bridge) can overclock a bit without raising voltage at all, and I wouldn't be surprised if you could reach 4 GHz without having to increase the voltage. It depends on how good of quality your chip is, though.
Increasing voltage can help you get higher, but do it sparingly. I typically will try using CPU offset voltage between +0.010v and +0.100v, but I won't go any higher, because the increase of heat and the risk to the processor makes it not worth while past this point in my opinion. Others have gone well past this limit, but I like to play it safe.
If you do try to overclock your CPU more, just keep voltage stable, raise it up 100 or 200 MHz, boot the PC and give it a stress test. If your temps are going past 85C, then you will need to get a new cooler and will want to back down now, but under that is reasonably safe. Continue increasing the CPU multiplier until either the PC won't boot, fails the stress test, or starts getting too hot. If any of those things happen, drop it down 100 MHz until the problem goes away. At that point, you can try raising voltage to go further (unless the CPU temperature was what stopped you), but you may not need to. The level of overclock reached at this point might have resolved your issue.
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