Pulling leafs will make it softer and lower. Your ride height is based on the free-arch height - weight*rate. The free arch won't change much as you pull leaves.
Most will not recommend it as a long-term approach as the normal progressive length of each leaf is not there anymore. Don't really know how the longevity is affected.
You could also consider selling them and buying others or finding somebody to trade with. Admittedly swapping a spring is more work than pulling some leaves, but if you go through 2 or 3 iterations to get the height you want, it could be more work overall.