rivet removal

[1972BackInBlackC10]

so im starting the process of cleaning and painting my frame, i want to remove the supports and body mounts etc so i can clean and paint everything properly. Im wondering what people have used to remove the rivets holding these parts on, iv been using a grinder and its slow going im sure no matter what method i use its going to be time consuming but just wanted to see if some methods work better or quicker than others

my friend had mentioned using a cold chisle and giving them a whack, but my hands are poor and its hard for me to hold onto smaller objects, plus i dont want to miss the chisel and whack my hand haha