A couple of points to make:You can tune your piano now, all you need is a tuning hammer and an electronic tuner. Does that mean you should be doing it? I have to admit being tempted because when I get my piano tuned it sounds great for a week and pretty good for a month and then it just needs to be tuned (it's fairly new so it's still breaking in). One thing I wouldn't worry about is breaking a string, you would have to crank the string well beyond correct pitch to run that risk.