The Konvas magazines are not difficult to load, you just have to be careful to maintain exactly correct loop sizes.
the problem with the Konvas mags is that they are quite picky about correct maintenance and calibration (pp spring pressure etc) and there is some compatibility issues if you try to mix different generation mags.
If you know what you buy it would not be a problem at all like with any equipment
the easiest way to load the Konvas mags by my opinion:
If you want a good old 35mm camera I recommend Cameflex! it is possible to get one in good condition, just make sure that it has NIKON MOUNT so that you can easily find good lenses for it