You'll need this
This sure beats twisting ur arm to scar it with a monkey wrench. You may have the space to work a wrench or a crescent tool, but there's no room to add a pipe for leverage and a very limited range of movement. It's a piece of cake with this.
Like the guys said, don't forget to lock the flat washer on by pressing the ends, change the boot rubbers while you're down there and count the number of turns when taking out the outer ends so u can put up the new ones (assuming you're changing all in one shot so u don't hafta go back there anytime soon) about the same so you'll be close enough to straight to make it safely to the alignment shop when you're done.
There's a buddy of mine that changes all our rack components when we need to, and here's why. He uses a piece of nylon string that he pulls around the four wheels to eyeball it and check the alignment when he's done.
It doesn't check camber, only toe, because of where he has to pass the nylon (but he didn't touch the camber bolts anyway so u're safe), but damn if by the time u get to the alignment shop and they put their machines on it, the wheels are already on perfectly straight!