It's not a step-by-step because as far as wood-lathe-bowl projects go, it's pretty basic- if you know the principles (which you should learn from someone in person if you can), I'm sure you can produce a similar result.
However, look how pretty it is! Learning the wood lathe is super fun, because since you use hand tools (special types of chisel), the process feels very hands-on. (As opposed to a digital-readout metal lathe.)
Perhaps this will inspire you to learn to use a wood lathe.
Oh, also: here's how to make the thread balls that are pictured in the bowl.