You have to look at your motivations. If it's anything other than doing it for business (you want to tune pianos for a living), I wouldn't recommend it.
As others have said, it's a skill that takes a lot of time and work. But think of this, now you know how to tune, so the instrument is more than your musical instrument, it's also something you can fix. I think the tendency then is to hear it more form the standpoint of how in tune it is, how well voiced, etc., rather than how well it makes music. Compare to the guys who fix their own cars. How much time do they spend with the car pulled apart tweaking it, versus just taking it out and enjoying it on the road? I know that I would be more critical of my instrument from a technical perspective if I learned how to do this.
Also, tuning is not a particuarly enjoyable activity I think. BANG BANG BANG (to help set the string) - do you really want to do that to your ears? Not me.
Chickering9's comment about wanting the best results is interesting, not sure what I would do in his situation. I probably would have seen if I could get somebody out of the area. Again for me the danger of it crowding out the music to some degree is too great. I'm relatively lucky to have a tuner/tech who I really like, I've met a lot of, shall we say, unsophisticated tuners in the area!
You didn't say why you want to do it, maybe to save money. If so, the most cost effective thing is to hire it out, and to install a DamppChaser and string cover. My tunings last quite long with a bit of humidity control.
Besides which, real musicians learn to not listen to their instrument anyhow ...
