Yea,,,,with your starting weight you don't want to go to failure. So you will want to reduce the weight initially. You want to try to increase the weight each day you do it so that your body responds to the added weight. So for the first day, you want a weight that you can do it pretty easy, then increase. Eventually, as your weight increases, you will reach failure. So when you can't do 5x5 with the added weight, do 5x3 or 3x5. Something so you can increase the weight, then go back to the weight where you first attempted the 5x5 you couldn't do before.