Doing Overhead Press

What's the Overhead Press? Press the bar from your front shoulders overhead until your elbows are locked. Your knees and hips must remain locked through the whole movement otherwise you're doing Push Preses. Stance should be shoulder-width apart (heels together is Military Press, which is harder).

Is the Overhead Press Safe? If you can't press the bar overhead, lower it back on your chest & put it on the floor.

The overhead press is a great movement—it's weightlifting's ultimate form. You can't half-ass it. You either get the weight over your head, or you punk out. End of story.
Because it's a demanding movement, it's easy to get stuck. Overhead press gains come much more slowly than gains from squats or deadlifts. Once you've hit a sticking point, adding even five pounds to an overhead press means you've done your damndest to strengthen and grow your shoulders, chest, traps, and arms.