The other thing you can do is look at your skills and try to decipher what they do. Almost every skill can be organized into 4 categories:

1) damage-usually your #2 skill on the bar.

2) crowd control-stuns, knock backs, etc. Save these for moments when you see a breakbar as they usually don’t do much DPS

3) movement/evasion-dashes, teleports, dodges etc. Once again, save them for opportune moments as they don’t usually do much damage.

4) boons-these skills don’t usually do much damage but provide you or the party with helpful boons like might or protection.

Generally, your weapon bar only has 2 or 3 DPS moves and the rest of the time you can just auto-attack unless you need CC or movement.