Need Overclocking Guide/Primer using MB Intelligent Tweaker

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I have a S-Series MB, GA-P43T-ES3G (http://www.gigabyte.us/products/product-page.aspx?pid=3637#ov) with a Intel Core 2 Duo E7500 2.93 GHz.

I would like to overclock this system by adjusting the the settings in the MB Intelligent Tweaker (MIT) in BIOS. Does anyone have a guide/primer showing the procedure?

I haven't overclocked before so I'm looking for what settings to change in MIT, what temperatures ranges are acceptable, etc.

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Here are my current (default) settings in MIT:

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Here are the specs on my G Skill RAM (http://www.gskill.com/products.php?index=222)

I'm using 2GB x2

System    Desktop
System Type    DDR3

M/B Chipset    
lntel Z77
Intel P67
Intel Z68
Intel P55
Intel X48
Intel X38
Intel P4x Series
AMD 790 Series
AMD 785 Series
AMD 890 Series

CAS Latency    9-9-9-24-2N

Capacity    
2GB (2GBx1)
4GB (2GB x2)
8GB (2GB x4)

Speed    DDR3-1600 (PC3 12800)
Test Voltage    1.5 Volts
Height     40 mm / 1.58 inch
Registered/Unbuffered    Unbuffered
Error Checking    Non-ECC
Type    240-pin DIMM

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Here my CPU temps:

The 1st jpg is at idle
The 2nd jpg is just after running 20 tests using LinX.
As you can see, running LinX peaked my temps at 59C. Most of the time the temps were around 55-57C during the tests.

FYI, my CPU is using passive heat pipe cooling (copper block on CPU with 4 heat pipes going to cooling fins on the computer case).