-groovatious-

+1

There are also many 'so called' tuners out there who do not do a good job. If you find a good one - stick with them.

Approach some good pro tuners to take you under their wing and train you.

That's not true. I've seen many pianos that require extensive amounts of work and tunings to get them back 'in shape' and 'in tune' after hack tuners and players have 'had a go' at tuning them. You can also damage the way the pins are set and can cause them to 'slip'. Not to mention that if you break a string - then you're in for many more problems.

Leave it to the professionals.