Honestly, would you attempt/or did some of you do this w/o air tools?

All I have is a Dewalt 18V cordless impact gun, it works great for lug nuts (supposedly good to 300lbs/ft but once you start using it this goes down, though I do have 2 quick-charge packs for it). But I don't know how effective it would be for a project like this. Plus its freakin huge, dont know if it'd even fit down there in some tight places. But it was free from a buddy at work so hey...

Thanks