In general, one sets the neck relief for the minimum necessary, then adjusts the nut and saddle heights to obtain the desired string height. Measure the vertical height from the top of the 12th fret to the bottom of each string. Subtract from that measurement the string height you desire. Double that value and that is how much needs to be removed from the saddle. Measure the amount of saddle projecting from the bridge and ensure that there will be sufficient saddle still projecting from the bridge to afford sufficient break angle of the strings over the saddle. If not, other remedies are required.
If the guitar has been sitting, and now has a high action, check that the bridge is not detaching, the neck is not detaching and that the top in the lower bout, in general, is not excessively bellied.
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