DON'T whatever you do rely on a jack. If you haven't got ramps or any other equipment then what I do sometimes is jack the car as high as it will go, then put a stack of stout wooden baulks, like sawn off railway sleepers, under the wheel and lower the wheel on to it so that virtually all the weight is on the suspension. Leave the jack in place as an added precaution.
You could use 6" concrete building blocks, but NOT house bricks.
A trolley jack directly under the suspension arm is the quickest method, because you don't have any wasted travel compressing/decompressingt the spring. But again, don't rely on the jack, put wooden blocks under the wheel to take most of the weight.

But as Erling says, the best method is the proper way with ramps.