If you turn any doug fir from the local hardware and lumber stores/yards, make SURE you wear PPE. Even for the older stuff, probably, you should make sure you are protected. That kind of lumber for construction is usually treated, which contains a variety of chemicals that are dangerous. This is particularly true for ground contact or near ground contact treated woods, which even with construction you need to make sure your protected from. Deck wood is less toxic, but if you are gonna make dust out of it, then its still pretty nasty and you'll want to make sure you are protected.
In fact, in the past, wood treatments often included arsenic, so the older doug fir from Ray's house might in fact be more toxic than modern stuff.
Just thought I'd bring that up, in the even you pick up any pieces of wood from the local hardware store to practice on, and if the old wood is treated with arsenic then...you'll want solid PPE either way. Some of the modern ground contact wood treatments or anything with arsenic in it...you probably want to protect your arms and all that too...