It took me a while to set the strafe buttons to A and D but it's worth it in my opinion, especially with classes like MNK where you need to move around bosses a lot since you want all your auto-attacks to hit. generally you use your mouse to control where you face and use strafe to circle around targets. Just play as you are doing now and adjust as you hit walls until you work out whats for you, especially with hotbars and the like. Having a mouse with at least 2 extra buttons helps too.