i just recharged my A/C on my car yesterday! first i try to see if my compressor works by just pushing the A/C button but of course it doesnt work and the light doesnt turn on either.theres a dual pressure sensor on the system so if the pressure is too high or too low the compressor will not turn on. so i tried my luck and bought a A/C recharging kit at kragen, you will have to get the retrofit kit like me, because OEM uses r-12 gas, while nowadays its cheaper to use r-134a gas. it comes with adaptors to make it r-134a compatible, and a dvd on how to!
. the low side where you recharge your system is right next to oil dipstick. btw was your A/C working before?