As I have understood, actively taking part in the manifestation process isn't the biggest part. In fact, one can screw it all by trying to control things too much. But I guess if you see your intentions manifesting, you automatically want to participate in it.
Intending one part of your life to improve and another part to be stagnant/go worse would make your life quite unbalanced and I doubt it'd be a good thing.
Funny that I had a sort of a similar dilemma some days ago. I wanted to download some videos from the net and had to choose whether to download them all simultaneously or one by one. First option would give me one video downloaded but others still left to download. Other option would give me all the videos at once but downloading would take more time. As I didn't have much time to watch those videos anyway, I decided to go for the second option. That's a bit flawed parallel though as life is not a string of movies that you can watch one by one, life is more like watching many TVs at one time...can get a bit distracting though.