DB shoulder press, any trick to getting the heavier weights over my head without a spotter?

Whenever I do shoulder presses with dumbbells, I have to use lighter weights since I can't seem to get the heavier ones over my head to start. I can do heavier if I can just get to the starting positon,but it's just too heavy to get up there. Is there any trick to this? When sitting, I use my knees to help swing the dumbbells up over my shoulders, but that only works with light weights (kind of hurts my lower back if I go heavier). Any tips on how to do this properly?

EDIT: When I'm talking about "heavier" weights, they're only around 30lbs / dumbbell. I'm still kind of a beginner, I'm not using the huge ones.

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