Those are a pain to get a wrench on.
A slim enough ratchet will work better.
The first time I did a set I used an open ended wrench, it worked but was a pain. The problem with a wrench, is you can't go flat/straight at the bolts, you have to angle your wrench enough to get to the nut.
The most recent time I used a craftsman max axess ratchet which made it a breeze.
Craftsman-Max-Axess-Universal-Socket-Set.jpg
Only difference between this writeup and the way I do it, is I just turned the wheels to the left to do the driver side, and to the right to do the passenger instead of taking them off.