Replacing a snap on a pair of shorts?

I have several pairs of shorts (for mountain biking). They are basically like board shorts with pockets.
But the problem is the snaps fit together loosely and come apart easily so the shorts are always coming unfastened while I’m riding my bike. Mountain biking sometimes has you moving around a lot.
How difficult is it to replace the waist snap with another more secure fastener ?
I tried one solution I saw online of slightly deforming the small part of the snap with pliers but it hasn’t helped.