I usually do it up at the top but not all the way and then line up the hub and strut, they obviously wont be straight, they'll be at an angle to each other but line up the bracket at the back with the gap in the hub and then push them inwards together and when they line up straight they will fall in and then just tap the hub up un til the bolt hole lines up.

p.s it will pay you to wedge a screwdriver in between the gap in the back of the hub just to open it a bit but make sure the screwdriver doesn't obstruct the strut going back in.

Hope that makes sense, sometimes its easier doing it then describing doing it