Actors go through a lot of preperation to become their characters. One of the most challenging things, especially in action films, is getting the training to look like an expert, despite only training for a few weeks.
You can see that in action with Keanu Reeves going through weapons training for John Wick 2. This footage comes by way of Aaron Cohen who helped Reeves during the process and who also designed a special concealed 'below the wait' holster that you can see in the footage.
This genuinely looks like hard work with a lot of concentration involved, even if it is just holstering and reloading weapons. No doubt it will all pay off like it did in the first film too.
Take a look: