I feel like it's not super difficult if you're catching the coin, if you're able to position the coin in the same place and apply the same force consistently you'll largely get the same height and speed of rotation. When I was a bored kid I was able to get a pretty consistent coin toss where it would land on the opposite of the side at the beginning. [0]

[0] Of course I didn't do any statistical analysis or a huge number of trials for this to really tell if I was able to do it but it felt pretty consistent.