Thats what I did with my friends. We trained each other, how to land flat, how to do each of the moves right. We were careful, didn't do anything that we wern't sure we could do and not get injured. The only injury was early on when we were still green, I did an armbar to quickly for my cousin to react and I dislocated a bone in his fore-arm. He didn't notice it for 3 days, went to a Doctor, 30 seconds later he walked out arm in place. He was wrestling 4 days later without a problem.