I voted 'no' for a few reasons..
In your inexperience, If you go too far and do something disasterous to your piano, when the technician comes to fix it, you have to explain how it happened, ie. how you are too cheap to pay him to tune, so you tried and then there was a loud SNAP, blah blah blah
also, the price of replacing a broken piano string runs into the hundreds! Whereas, you can find acceptable guitar strings in a '20 for 3$' type of thing.
Also, violinists and guitarists can tune constantly, even while playing! If you are playing the piano and have a good enough ear to tell that a certain note isnt quite where it should be, well, there's nothing you can do about it, now is there?! In fact, if your ear is sophisticated enough to hear the slightly bad notes, the fact that you can't do anything about it right away will really piss you off during a performance.
also, when I talked to my past tuner, he said that since he started tuning, he is incapable of enjoying a performance at a concert hall because all he can focus on is how the piano is going more and more out of tune during the evening. Basking in the ignorance of my tin ear, I am glad to say I do not envy him!