Are you the guy who wants 100% so bad and are struggling with the weapon skills? Then I might help you, my friend.
The easiest way to use a skill as fast as possible is to get the cool down as tiny as possible... sounds quite simple, I know; But how can you exploit this the most efficient way?
Easy. Just buy the weapon art for the Handgun, equip the skills you want to level up with your Handgun and go to a dungeon where a lot of mobs are. Now kill a few mobs, until you can use your Handgun art and activate it. Now you can spam your skills with almost no cool down.
I hope you did not know this until now, so I could help some of you .
Have a nice day,
Reii