If you are shooting standard ammo, going to a lighter spring isn't going to hurt the gun too much. eg., going from 18lb/16lb to 14lb in 5" 45 acp 1911. It is just going to change the recoil characteristics. Lighter spring may make the gun a little easier to control for follow up shots as the gun will not dive forward as much when the slide returns. The brass will eject further.
Cocking the hammer before racking the slide will make it easier too.
If you put in a flat bottom (zero radius) firing pin stop, you can go with an even lighter recoil spring.
Springs are not that expensive so might as well get a few in the range you are interested in, or go for a multi spring calibration pack and experiment.