I thinks its normal that you set first one truster before you set the other.
But, if you play it ofthen, you'll see that it becomes as a normal habbit to you.
If you use the truster be sure that you're under the 2 knots to see reaction.Also use them softly, the ship will react compared the way you use the trottles.
To do it good, you have to make the manouvre allready in your head,and know the ship specifications.
Marc