Removing Control arm from 97 tercel

I need to replace bent lower control arm from my daughters Tercel. I found a nice one at junkyard. Also found that the main pivot bolt the connects the arm to the frame is a hard one to handle by hand. I was able to loosen the bolt by hand, turning it about 4 time. After that, it became stuck. Plan on putting impact wrench on it tonight, but am concered I will snap the bolt. I guess I would like to know if this bolt is suppose to be this stubborn, and if this is normal.