Default overclocking my 8125 i need tips/help

im rather new at this but i cant stand how slow the 8125 is
ive done all the hacks for it and ive seen a bit of a speed up
but i saw something called overclocking but i also heard if you do it wrong it can really mess up your phone so if anyone can help me by linking me to the best/free overclock program and what settings for my 8125 that would be great thanks!