To load a single shot pistol, caplock or flint, I sometimes kneel, pistol between my knees as I pour in powder, set the patch and ball on top of the muzzle, then hold the pistol around the muzzle with my left hand, whilst with one crack of the knob on my starter using the right hand, I seat the ball flush with the muzzle, then set the long shaft of the starter on the ball, holding the rod between forefinger and thumb of the left thumb, and one smack using the right, down she goes onto the powder.
Tap, tap, tapping to get it flush as I've witnessed some do when loading, merely damages the ball, wherein one smack barely flattens it's upper surface, the spure.
If I load while standing, I put the pistol under my arm while loading powder using two hands to measure, then pour it in, then do pretty much the same as above with patch and ball. Easier done than explained, especially for someone so handicapped in vocabulary as myself.