Or just do it the easy way and buy the tool!
Lisle makes one too that you can buy for about $30 at Pep Boys.
I prefer these types of clamps over the screw/worm type because you don't have to worry about readjusting them for aging of the hose.
Just getting them on/off is such a bitch that it makes you want to use the worm style.
Anyways the tool is nice because it locks the clamp in the open position while you maneuver the clamp into place then you release the lock on the grips and the clamp closes in place. If you mess up, no worries, get the outer/inner jaws of the clamp retainer of the tool aligned and squeeze the tool handle to recompress the clamp. Takes seconds.
And, it's easy to work in tight locations.