Self-repair of a smartphone.

Is it possible to repair a modern smartphone myrself? I would like to change the broken screen and change the battery at the same time, because the phone does not hold a charge well. I even found where to buy mobile spare parts wholesale online. Has anyone had this experience?

Sure. Be prepared for some tedious work though. It takes a lot of patience, the right tools and supplies but, it can be done. Don't be surprised if you mess up a bit, especially on the first one. It happens.