Simple coilover adjument question

[Onefast99gsx]

Sounds like a dumb question but i've never had coilovers before until I bought this 99GSX with coilovers already on it. I want to lower the car about .75". To save me some jack time, do i unscrew the threaded coil adjuster towards the ground or in towards the top of the car?

Also, is it generally a 1:1 ratio meaning if you unscrew/screw it say 1", that's the equivalence of raising/lowering it 1"?

Thanks for the help.