Making LEDs blink is what people think make Makers happy, but they are wrong. Makers want to be miserable. They like to make mistakes and to have to try things over and over again. That which does not kill us, makes us stronger. This project will make you strong!
Hand soldering a 1206 is easy and makes me happy, so I decided to see how far down the package sizes I could go before I was reduced to tears. I can do a 0402 package by hand, but it isn't pretty.
My biggest hurdle was determining orientation of the LEDs. You need to refer to the datasheets because each one has different markings. You will also need a USB microscope or really good magnifying glass for the smaller packages.
You are also going to need a good set of tweezers. Robots, who will rule us shortly, have no trouble picking and placing these devices (without error or complaint I might add), but shaky hands and faulty eyes make this a sad affair all around for us miserable mortals. If your luck is as bad as mine, you will spend lots of time frustratedly looking for microscopic dots when they fling out of your tweezers. Buy several extras of each size because the universe will go out of its way to make sure you will need them.