Video overclocking! need help!

hey i have a geforce 2 and am interested in overclocking it, but have a few questions

1. how do i change the memory / core clock speeds
2. how do i measure the temperature

any other tips would be greatly appreciated

tip is: get a driver tweaker like rivatuner. it will let you overclock the card plus messing around with all the settings of the video card driver.
to read temps from the card there should be sensors in it, if there arent any stock sensors youll need to install them so the software will read temperatures from them.