My suggestion to someone just getting started is to go ahead and buy liquid fertilizers first.
and see how things go, how much of each you are adding and the plant response.
Then buy the dry ferts and refill the bottles with the same amount of active ingredient. By then you will be much better prepared to alter the formula to suit the way your plants respond.
One reason for not doing it this way, but, instead, dosing in non-limiting amounts per an EI type program is that it will let you see what plants that are growing without any nutrient limits look like. Once you know what they look like, you can start reducing how much you dose, and you can recognize when they don't look as good as they should. This has been one of Plantbrain's pieces of advice for some time now, and it seems to be very valid to me.