Inspired by this joke
Q: How many Karateka does it take to change a light bulb?
A: 100 - 1 to do it and 99 to tell him "That's not the way I was taught to do it".
Let's break this down -
Most lightbulbs are too high up to reach; so we need something to stand on. Chair, table, box, whatever - It doesn't matter what, as long as it's stable and helps you reach your goal. A 'base' or 'platform' if you will.
It doesn't matter what technique you use.
It doesn't matter what hand you use.
It doesn't matter whether you switch the power off at the wall first (so long as you don't stick your fingers in the socket to see if it's still live). :)
What matters is that you have a solid platform to stand on and that the old dead bulb comes out before the new live one goes in. And you weren't electrocuted in the process
What matters is that, at the end, there's light where there wasn't before. :)