I’m trying to figure this out. Who can help?

I have a 14 foot aluminum boat, with a 25HP Evinrude, and I want to know, do I adjust the trim of the motor to keep the nose of the boat down? I don’t want to add a bunch more weight to the front, when I take the boat out by myself. With my son, its fine, he’s added 125 pounds to help, but if I go solo, I do not want to add extra weight, if I don’t have to. What else can be done to counteract that problem?