A pastor once gave his congregation an interesting illustration of the "Seek ye first" verse. He had two gallon jugs, and beside each jug he had bags of superballs, BBs and sand. In one jug he started with sand, then BBs, then superballs, but he couldn't fit half the superballs in the jug. In the second jug he started with the superballs, then poured the BBs in, then the sand. Everything fit nicely because the BBs filled in the space around the superballs and the sand filled in the space around the BBs.
Priorities are things that need to be established BEFORE they conflict. It is very important to decide what is more important than what before it comes to the point where a decision has to be made which will take priority. Once priorities are established, make time for the most important things. Then make time for the lesser things, and then minor things can schedule in around those.
It is also important to be honest with oneself about priorities. If I say "A is more important than B" but every time a conflict comes up B supersedes A, B has a higher priority and I am lying to myself about which is more important to me.