I have a question about a mid 80s 80hp mercury outboard motor. The motor is not equipped with power trim. The motor is in the up position for trailering and will be launched tomorrow and kept in a marina all season. Without the power trim (I've only operated a boat equipped with power trim) how do I find and set the motor at the appropriate angle. Is it dangerous to leave it in the down position. I don't believe there is a locking mechanism for the down position but I'm not sure. Just a few things I'm unsure of but want taken care of before its in the water