The load capacitance of a crystal is nothing to do with how hard the crystal is driven. That is the crystal power, measured in microwatts.
A crystal acts like a very good tuned circuit, with an inductance and a capacitance in series. By adding a capacitor in series with the crystal, the frequency can be altered slightly. As a result, the crystal will be made to match the load capacitance that it will be used with.
If you use the wrong load capacitance, it will only shift the frequency by a few hundred ppm at most. In other words, less than 0.05%
If you don't need the best accuracy, load capacitance doesn't matter at all.